Reviewed by Laura Martin on August 15, 2016
National Institute on Drug Abuse: "DrugFacts: Marijuana," "Is there a link between marijuana use and psychiatric disorders?" "Is marijuana a gateway drug?"; Gallup: "One in Eight U.S. Adults Say They Smoke Marijuana."
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So how does pot affect your brain if you use it for a long time? Well, that's not clear. There's simply not much research yet. Long-term use may raise some people's risk for drinking problems, nicotine addiction, and more. And if you have a mental illness, marijuana can make it worse.
Overall, pot-related problems tend to be more serious if you start using the drug heavily in your teens. Research suggests that smoking it daily may even affect your intellectual level. Some good news -- most people who use marijuana don't go on to take harder drugs. For WebMD, I'm Dr. Michael Smith.