What Is Marijuana? Definition, Usage, Effects, Addiction

Marijuana is a psychoactive drug that affects brain function and leads to dependence in some users. It comes from the Cannabis plant and is widely used for both medical treatment and recreational effects. The active compound tetrahydrocannabinol (THC) alters mood, perception, and cognitive function, making it appealing to many but also leading to health risks and addiction in certain cases.

Marijuana is used for medical treatment to help patients manage chronic pain, multiple sclerosis, and epilepsy, offering relief where other medications fail. Cancer patients undergoing chemotherapy use it to reduce nausea and stimulate appetite. While medical marijuana provides benefits for some, it is not risk-free, and long-term use leads to dependency, memory impairment, and respiratory issues.

Recreational use of marijuana is common due to its euphoric and relaxing effects, but it also impacts reaction time, coordination, and mental clarity. Some users experience anxiety, paranoia, or dizziness, particularly with high doses. People who use marijuana frequently find themselves relying on it to manage stress, sleep, or social interactions, which are a sign of dependency.

Marijuana is for those who start at a young age or use it regularly. Some users develop withdrawal symptoms like irritability, cravings, and trouble sleeping when they try to stop. As noted by Volkow et al. (2014) in “Adverse health effects of marijuana use,” about 9% of users develop addiction, with rates rising to 17% for those who begin in adolescence. Recognizing early signs of dependency helps individuals seek treatment before it becomes a larger issue.

What Is Marijuana?

Marijuana refers to the dried leaves, flowers, stems, and seeds of the Cannabis sativa L plant, which contains over 125 cannabinoids, including delta-9 tetrahydrocannabinol (THC), the compound responsible for its psychoactive effects. Marijuana is green, brown, or gray, and it is sold in loose-leaf form, compressed bricks, or ground into a fine texture.

Marijuana is classified into drug-type and fiber-type cannabis, based on its THC-to CBD-ratio. Drug-type marijuana has a THC/CBD ratio greater than 1, meaning it contains high levels of THC, which produces intoxicating effects. Fiber-type cannabis, also known as hemp, has a THC/CBD ratio lower than 1, making it unsuitable for recreational use.

Marijuana is a psychoactive drug that affects brain function, altering mood, cognition, and perception. It is categorized as a Schedule I controlled substance under U.S. federal law, meaning it is considered to have a high potential for abuse and no accepted medical use at the federal level, despite its legalization for medical and recreational use in several states.

The street names for marijuana include dope, pot, grass, weed, Mary Jane, ganja, hashish, hash, bhang, bud, herb, and reefer. These names are used in different regions and cultures to describe marijuana in its various forms, including loose flower, compressed resin (hashish), and liquid concentrates. As noted by Strang et al. (2015) in “Heroin on Trial: Systematic Review and Meta-Analysis of Randomised Trials of Diamorphine-Prescribing as Treatment for Refractory Heroin Addiction,” marijuana has addiction rates of approximately 9%, increasing to 17% for those who start young and up to 50% for daily users, highlighting its potential for dependence and long-term use disorders.

How Is Marijuana Consumed?

Marijuana is consumed through smoking, vaping, eating edibles, dabbing concentrates, and brewing into tea, with each method affecting the body differently. It originates from the Cannabis plant, which contains over 125 cannabinoids, including delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD). THC produces psychoactive effects, while CBD is used for therapeutic purposes without intoxication.

The ways marijuana is consumed are listed below:

• Smoking: Dried marijuana is burned and inhaled, rapidly delivering THC to the brain. This method increases exposure to toxins and carcinogens, leading to lung irritation and respiratory issues.
• Rolling: Marijuana is wrapped in paper, like a cigarette, and smoked. This method produces effects within minutes but also exposes users to harmful chemicals in rolling papers.
• Injecting: Marijuana extracts are sometimes converted into injectable forms, though this is rare and extremely dangerous due to infection risks and unpredictable potency.
• Brewing: Cannabis is infused into tea or other beverages, producing delayed but long-lasting effects that increase the risk of overconsumption.
• Dabbing: Concentrated THC extracts are vaporized and inhaled, creating an intense and immediate high. This method carries a high risk of overdose symptoms, including extreme paranoia and hallucinations.
• Vaping: Marijuana oils or dried flowers are heated and inhaled, delivering THC without combustion. Although marketed as safer than smoking, vaping has been linked to lung disease and unknown long-term effects.
• Eating: Marijuana is consumed in edibles like gummies, baked goods, and candies, taking up to two hours to produce effects. The delayed onset leads users to consume excessive amounts, increasing the risk of severe impairment and overdose-like symptoms.

How Common Is Marijuana Use?

Marijuana use is increasing in both Indiana and the United States, with higher rates among young adults and unemployed individuals. From 2002 to 2014, past-year marijuana use among U.S. adults aged 18 and older rose from 10.4% to 13.3%, while daily or near-daily use increased from 1.9% to 3.5%. Among 18- to 25-year-olds, past-month use rose from 17.3% to 19.6%, and among adults 26 and older, it increased from 4.0% to 6.6%. Higher use correlates with greater risks of cannabis use disorder (CUD), particularly among those who begin in their teens. As noted by Compton et al. (2016) in “Marijuana use and use disorders in adults in the USA, 2002–14,” approximately 9% of users develop dependence, with rates rising to 17% for those who start young.

What Is Marijuana Used For?

Marijuana is used for medical treatment and recreational purposes, with different effects depending on how it is consumed and the individual’s tolerance. Medical marijuana is used to manage chronic pain, anxiety, and sleep disorders, providing relief for individuals who do not respond well to traditional medications. 

Patients report improvements in pain levels, mood, and overall quality of life indicating a reduced need for prescription drugs. Recreational marijuana is used for relaxation, euphoria, and sensory enhancement, though frequent use leads to dependency and cognitive impairment. As noted by Vandrey et al. (2020) in “Medical Cannabis Consumers Use Less Healthcare Resources and Report Better Quality of Life,” medical cannabis users reported a 9% reduction in pain scores, 12% less anxiety, and 39% fewer emergency room visits, suggesting potential benefits but also highlighting the need for continued research.

Is Marijuana Use Legal in Indiana?

No, marijuana use is illegal in Indiana for both medical and recreational purposes despite growing public support for legalization. As of January 2025, state laws prohibit possession, sale, and use, with no approved medical marijuana program. A 2024 Ball State University survey found that 54% of Hoosiers favored recreational cannabis for adults, 32% supported medical marijuana, and less than 10% wanted it to remain illegal. 

Government continues to oppose legalization, while groups like the Midwest Hemp Council argue for economic benefits and agricultural opportunities. As noted by Swanson (2025) in “Legalizing Marijuana in 2025 Not Likely,” youth marijuana consumption has declined in states with regulated markets, suggesting potential public health benefits if Indiana were to reconsider its stance.

What Are the Effects of Marijuana?

The effects of marijuana are euphoria, impaired memory, sedation, increased heart rate, and long-term cognitive decline, with risks that vary based on frequency and dosage. Short-term use alters sensory perception, reaction time, and coordination, while long-term use is linked to heart disease, schizophrenia, and addiction. The likelihood of dependence increases with frequent use, particularly in those who start at a young age.

Short-Term Effects of Marijuana

The short-term effects of marijuana are given below:

• Euphoria and Mood Changes: Produces feelings of relaxation or anxiety, depending on THC levels and individual tolerance.
• Impaired Memory: Reduces the ability to retain and process information, affecting learning and decision-making.
• Sedation: Causes drowsiness and sluggishness, making daily activities and driving dangerous.
• Dizziness: Leads to lightheadedness or loss of balance, especially when standing up. As noted by Volkow et al. (2014) in “Adverse Health Effects of Marijuana Use,” marijuana increases heart rate by 20–50 beats per minute, further contributing to dizziness.
• Slowed Reaction Time: Impairs coordination and reflexes, increasing the risk of accidents and injuries.
• Hallucinations and Delusions: In high doses, marijuana triggers psychotic symptoms, including paranoia and altered reality perception.
• Increased Heart Rate: Strains the cardiovascular system, raising the risk of heart complications. As noted by Franz et al. (2016) in “Marijuana Use and Cardiovascular Disease,” marijuana use quadruples the risk of heart attack in the first hour after smoking.

Long-Term Effects of Marijuana

The long-term effects of marijuana are given below:

• Heart Disease: Increases blood pressure and heart rate, leading to higher risks of stroke and heart attacks.
• Schizophrenia: Worsens psychotic symptoms in those with genetic predispositions, leading to long-term mental health issues. As noted by Testai et al. (2022) in “Use of Marijuana: Effect on Brain Health,” frequent marijuana use is linked to an increased risk of anxiety and depression symptoms.
• Periodontal Disease (Gum Disease): Weakens the immune response in the mouth, leading to chronic inflammation and tooth loss.
• Spermatogenesis Issues: Low sperm count and quality, reducing male fertility.
• Slowed Wound Healing: Delays tissue repair, increasing the risk of infection and surgical complications. As noted by Heath et al. (2022) in “Marijuana in Orthopaedics: Effects on Bone Health, Wound-Healing, Surgical Complications, and Pain Management,” marijuana use is associated with poor post-surgical outcomes and delayed recovery.
• Marijuana Use Disorder: This leads to dependency and withdrawal symptoms, including irritability, cravings, and sleep disturbances. As noted by Volkow et al. (2014) in “Adverse Health Effects of Marijuana Use,” between 9% and 30% of marijuana users develop marijuana use disorder, with the highest risk in adolescents and daily users.

How Does Marijuana Affect the Brain?

Marijuana affects the brain by altering memory, learning, attention, decision-making, coordination, emotions, and reaction time. THC interacts with cannabinoid receptors in brain regions responsible for cognitive function, leading to short-term memory impairment and reduced learning ability. Attention and focus decline, making it harder to process information and complete complex tasks. Decision-making becomes impaired, increasing risk-taking behaviors and poor judgment.

Coordination and reaction time slow, affecting motor skills and increasing accident risks. Emotional regulation becomes unstable, leading to anxiety, paranoia, or mood swings. As noted by Paton (1975) in “Pharmacology of Marijuana,” the effects of THC on brain function are more pronounced in frequent users, particularly those who begin at a young age.

What Are the Risks of Marijuana?

The risks of marijuana are impaired driving, increased injuries, poor athletic performance, and mental health issues, all of which worsen with frequent use.

The risks of Marijuana use are listed below:

• Motor Vehicle Crashes: Slows reaction time and coordination, increasing the risk of accidents and fatalities.
• Injury Among Adults Over 65: Impairs balance and coordination, leading to a higher risk of falls and fractures.
• Athletic Performance: Reduces motor control and endurance, negatively affecting strength, speed, and reaction time. As noted by Paton (1975) in “Pharmacology of Marijuana,” THC impacts neuromuscular function, making activities requiring precision more difficult.
• Mental Health Issues: Contributes to depression, anxiety, and psychosis, particularly in individuals with preexisting conditions.
• Cannabis Use Disorder: This leads to dependence and withdrawal symptoms, such as cravings, irritability, and sleep disturbances.
• Edible Marijuana Risks: Causes delayed intoxication, leading to overconsumption and severe impairment. As noted by Lin et al. (2022) in “Edible Marijuana Products and Potential Risks for Pediatric Populations,” edible marijuana increases overdose-like reactions, especially in young users.

What Are the Risks of Using Marijuana During Pregnancy?

The risks of using marijuana during pregnancy are preterm birth, low birth weight, fetal growth restriction, and developmental delays, affecting both the mother and baby. Marijuana crosses the placenta, exposing the fetus to THC, which disrupts brain and organ development. Babies exposed to marijuana in the womb have a higher risk of breathing issues, feeding difficulties, and long-term cognitive impairments. As noted by Martin (2020) in “Marijuana: The Effects on Pregnancy, the Fetus, and the Newborn,” prenatal marijuana use is linked to poor birth outcomes and higher rates of neonatal intensive care unit (NICU) admissions.

Can You Get Addicted to Marijuana?

Yes, you can get addicted to marijuana, and frequent use increases the risk of marijuana use disorder. People who use marijuana regularly develop tolerance, cravings, and withdrawal symptoms, making it difficult to stop. The likelihood of marijuana addiction is higher for those who start before age 18 or use marijuana daily or near-daily. As noted by Gorelick (2023) in “Cannabis-Related Disorders and Toxic Effects,” between 9% and 30% of marijuana users develop dependence, with the highest rates among adolescents and heavy users.

What Makes Marijuana Addictive?

Marijuana is addictive because of its effects on brain chemistry, particularly through THC and CBD. Delta-9-tetrahydrocannabinol (THC) binds to cannabinoid receptors in the brain, increasing dopamine release and reinforcing drug-seeking behavior. The surge in dopamine creates feelings of euphoria, which makes continued use more appealing. Cannabidiol (CBD), while non-intoxicating, still influences the brain’s response to THC by modulating its effects. As noted by Dhein (2020) in “Different Effects of Cannabis Abuse on Adolescent and Adult Brain,” THC has a stronger impact on younger brains, increasing the risk of addiction in adolescents.

Does Marijuana Have Withdrawal Symptoms?

Yes, marijuana has withdrawal symptoms, which occur when frequent users stop using the drug. Symptoms start within 24 to 48 hours, peak within the first week, and last up to two weeks. Common withdrawal symptoms include irritability, anxiety, insomnia, decreased appetite, restlessness, headaches, nausea, and intense cravings. As noted by Berenson (2019) in “Marijuana Is More Dangerous Than You Think,” withdrawal symptoms make quitting difficult, contributing to continued use and addiction.

Can You Overdose on Marijuana?

No, you cannot fatally overdose on marijuana, but excessive use leads to severe toxic effects. High doses of THC overwhelm the brain’s cannabinoid receptors, causing extreme psychological and physical distress. The main reason for overdose-like reactions is the delayed onset of edibles, leading users to consume excessive amounts.

Common overdose symptoms include paranoia, hallucinations, extreme anxiety, vomiting, dizziness, rapid heart rate, and loss of consciousness. As noted by Bortoletto et al. (2022) in “Impact of Tobacco and Marijuana on Infertility and Early Reproductive Wastage,” marijuana-related toxicity has been linked to increased emergency room visits, especially in states where recreational use has been legalized.

How Does Marijuana Interact With Other Substances?

Marijuana interacts with other substances in ways that increase health risks, addiction potential, and unpredictable side effects. When laced with synthetic cannabinoids, marijuana becomes far more potent, increasing the risk of severe paranoia, hallucinations, and psychotic episodes. Combining marijuana with opioids or benzodiazepines enhances its sedative effects, leading to extreme drowsiness and respiratory depression.

Mixing marijuana with stimulants like methamphetamine increases heart rate and blood pressure, which leads to cardiovascular complications. As noted by Connor et al. (2021) in “Cannabis Use and Cannabis Use Disorder,” polydrug use involving marijuana is linked to a higher likelihood of developing substance use disorders.

What Are the Dangers of Mixing Marijuana and Alcohol?

The dangers of mixing marijuana and alcohol include increased impairment, higher overdose risk, and cognitive dysfunction. Both substances affect the central nervous system, leading to delayed reaction time, poor coordination, and memory loss. Mixing marijuana and alcohol amplifies these effects, making accidents and injuries more likely.

Alcohol enhances THC absorption, intensifying its psychoactive effects and leading to stronger intoxication. As noted by Volkow et al. (2016) in “Effects of Cannabis Use on Human Behavior, Including Cognition, Motivation, and Psychosis: A Review,” individuals who use both substances simultaneously are more likely to engage in risky behaviors and develop addiction-related problems.

Can You Use Marijuana and Cocaine Together?

No, you should not use marijuana and cocaine together because the combination increases the risk of heart complications, psychosis, and addiction. Cocaine is a stimulant, while marijuana has both depressant and stimulant properties, creating opposing effects in the body. This imbalance causes rapid heart rate, high blood pressure, and an increased risk of heart attack or stroke.

The combination also increases dopamine surges, reinforcing addiction and compulsive drug use. As noted by Adamson et al. (2010) in “An Improved Brief Measure of Cannabis Misuse: The Cannabis Use Disorders Identification Test-Revised (CUDIT-R),” individuals who mix marijuana with stimulants are more likely to develop cannabis use disorder and other substance-related problems.