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  1. Tetrahydrocannabinol - Wikipedia

    While human overdose is rare, THC can interact with other drugs and has a complex pharmacokinetic profile. THC is classified variably under international and US law, with …

  2. What is THC? Benefits, uses, and safety - Leafwell

    Oct 8, 2025 · THC is short for tetrahydrocannabinol. It’s the main compound in cannabis, responsible for the intoxicating “high” you may feel when you consume some cannabis products.

  3. The Effects, Risks and Side Effects of Marijuana (Weed, Cannabis, THC)

    Sep 9, 2025 · The higher the THC amount, the stronger the effects on the brain—likely contributing to increased rates of marijuana-related emergency room visits. While there is no …

  4. Delta-9-Tetrahydrocannabinol: What to Know About THC

    Dec 21, 2025 · THC, or delta-9-tetrahydrocannabinol, is the best-known psychoactive compound found in marijuana. Learn more about the effects, medicinal uses, and risks of THC.

  5. THCA vs THC: What’s the Difference and Why It Matters

    4 days ago · Learn how THCA and THC differ, how heat changes their effects, and what to know about consumption, potency, and legality.

  6. Cannabis Health Effects | Cannabis and Public Health | CDC

    Feb 16, 2024 · There are several risk factors and negative health outcomes associated with cannabis use.

  7. Cannabis (Marijuana) and Cannabinoids: What You Need To Know

    The word “marijuana” refers to parts of or products from the plant Cannabis sativa that contain substantial amounts of tetrahydrocannabinol (THC). THC is the substance that’s primarily …

  8. Understanding THC: What Is THC & Its Effects | Body and Mind

    Mar 4, 2025 · Tetrahydrocannabinol (THC) is the primary psychoactive compound produced by the Cannabis Sativa plant species, which means it is the cornerstone of cannabis’s effects. …

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

    Dec 25, 2025 · What is the active ingredient in marijuana? Tetrahydrocannabinol (THC) is the active ingredient present in all parts of both the male and female marijuana plants, but it is …

  10. Marijuana - DEA.gov

    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 produces the …