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  1. Marijuana | History, Effects, THC, & Legality | Britannica

    Dec 25, 2025 · Marijuana, drug composed of the leaves and flowers of plants in the genus Cannabis. Marijuana is known by several other names, including pot, grass, and weed. It can vary widely in …

  2. Cannabis (drug) - Wikipedia

    Cannabis (/ ˈkænəbɪs /), [2] commonly known as marijuana (/ ˌmærəˈwɑːnə /), [3] weed, pot, and ganja, among other names, is a non-chemically uniform psychoactive drug from the Cannabis plant. Native …

  3. What to know about pot addiction and treatment | AP News

    Doctors say it's possible to get hooked on pot. There's a widespread misconception that marijuana is not addictive, and it's expanded as a growing number of states legalize pot.

  4. Know the Effects, Risks and Side Effects of Marijuana - SAMHSA

    Sep 9, 2025 · Marijuana is the most commonly used illegal substance in the U.S. and its use is growing. Marijuana use among all adult age groups, both sexes, and pregnant women is going up. At the …

  5. Marijuana (Cannabis, Weed): What It Is, Side Effects & Risks

    Marijuana is a mind-alerting substance that comes from the Cannabis sativa plant. Other names for it are weed, pot and dope.

  6. Marijuana: Effects, Medical Uses and Legalization - Drugs.com

    Marijuana is used as a psychoactive, mind altering recreational drug and for certain medical ailments. The active agent that leads to the "high" is THC (delta-9-tetrahydrocannabinol). According to the …

  7. Marijuana - Mayo Clinic

    Aug 15, 2025 · There are more than 100 active compounds in cannabis. The most common cannabinoids are delta-9 tetrahydrocannabinol, also called THC, and cannabidiol, also called CBD. …

  8. Marijuana - DEA.gov

    Mind-altering psychoactive drug. Dry, shredded, green/brown mix of flowers, stems, seeds and leaves from the cannabis sativa plant. THC (delta-9-tetrahydrocannabinol) is the main ingredient that …

  9. Cannabis (Marijuana) | National Institute on Drug Abuse (NIDA)

    Sep 24, 2024 · In recent years, there have been big increases in the variety of cannabis products and how much THC they have, as well as a greater variety of ways people can consume them. Unless …

  10. Marijuana - MedlinePlus

    Mar 8, 2024 · Marijuana contains the mind-altering chemical THC. Some U.S. states approve the use of medical marijuana.