“Marijuana isn’t addictive.” “No one has ever gotten killed from smoking marijuana, it doesn’t hurt.” “Marijuana isn’t bad, it is a plant, it’s natural.”
These days, marijuana is often described as harmless, natural, or not really a drug at all. As laws and social attitudes change, it’s become common to hear people say, “It’s just weed.” But when you look at the science, this idea doesn’t hold up. Marijuana is a drug — and pretending otherwise only creates confusion and risk.
A drug is any substance that changes how the body or brain works. By that basic definition alone, marijuana qualifies. It contains THC, a chemical that causes a “high” by changing how the brain sends and receives messages. That’s not a side effect — it’s the whole point of using it. 4, 1
THC affects parts of the brain that control memory, judgment, mood, and coordination. That’s why people using marijuana may have trouble focusing, remembering things, reacting quickly, or making clear decisions. Scientists know these effects happen because THC attaches to brain receptors that normally help regulate balance and emotion. Marijuana doesn’t just relax the brain — it interferes with how it normally works. 1, 8
Marijuana also activates the brain’s reward system. It increases dopamine, the same chemical involved in pleasure and addiction for substances like alcohol and nicotine. Over time, the brain adjusts to these dopamine bursts. This can lead to tolerance, meaning a person needs more marijuana to feel the same effect. 6, 9
Another common myth is that marijuana isn’t addictive and doesn’t cause withdrawal. Medical research says otherwise. Nearly half of people who use marijuana regularly experience withdrawal symptoms when they stop. These can include irritability, anxiety, sleep problems, low mood, and loss of appetite. These symptoms are real enough that the American Psychiatric Association officially recognizes cannabis withdrawal in its diagnostic manual. 3, 2
Withdrawal happens because the brain has gotten used to regular THC. When the drug is suddenly gone, the brain needs time to rebalance — a process that can take weeks. During that time, many people feel uncomfortable enough to return to using, even when they want to quit. 5, 7
Calling marijuana a drug isn’t about fear, shame, or going backward on policy. It’s about honesty. When we treat marijuana as harmless, people are less likely to notice warning signs like dependence, memory problems, or emotional changes — especially young people and those with mental health challenges. 1, 8
We can have thoughtful conversations about legalization, medical use, and personal freedom. But those conversations need to start with facts. Marijuana changes the brain, affects behavior, can lead to dependence, and causes withdrawal. That’s what drugs do.
Calling marijuana a drug doesn’t make it evil. It makes the discussion real. This is an OPINION piece backed by peer reviewed studies.
- Abuse, N. I. (n.d.). Cannabis (Marijuana). Retrieved from nida.nih.gov: https://nida.nih.gov/research-topics/cannabis-marijuana
2. Anees Bahji, M., Stephenson3, C., & Richard Tyo, B. R. (2020, April 9). Prevalence of Cannabis Withdrawal Symptoms Among People With Regular or Dependent Use of Cannabinoids. Retrieved from JAMA Network: https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2764234
3. Clinic, C. (2024, October). Marijuana (weed) Withdrawal. Retrieved from Cleveland Clinic: https://my.clevelandclinic.org/health/diseases/marijuana-weed-withdrawal
4. DEA. (2020, April). Marijuana/ Cannabis Drug Fact Sheet. Retrieved from dea.gov: https://www.dea.gov/sites/default/files/2020-06/Marijuana-Cannabis-2020_0.pdf
5. Jason P.Connor, D. S. (2020, October 27). Clinicalmanagementofcannabiswithdrawal. Retrieved from online library wiley: https://onlinelibrary.wiley.com/doi/pdf/10.1111/add.15743
6. Lee, J. (2024, February). tetrahydracannibinol and dopamine D1 receptor. Retrieved from Frontiers in Neuroscience: https://www.frontiersin.org/journals/neuroscience/articles/10.3389/fnins.2024.1360205/full
7. Preuss, U. B. (2017, April 27). The cannabis withdrawal syndrome: current. Retrieved from t and f online: https://www.tandfonline.com/doi/pdf/10.2147/SAR.S109576
8. Stringer, H. (2023, June 1). How does marijuana affect the brain? Psychological researchers examine impact on different age groups over time. Retrieved from American Psychological Association: https://www.apa.org/monitor/2023/06/marijuana-effects-brain
9. Insights, B. (2025, July 24). Cannabis and Dopamine: The Effect on Your Brain. Retrieved from Biology Insights: https://biologyinsights.com/cannabis-and-dopamine-the-effect-on-your-brain/