Marijuana


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What is marijuana?

Whatever the impetus, Anslinger sought a federal ban on the drug, and to this end he initiated a high-profile campaign that relied heavily on racism. He believed that smoking pot would result in their having sex with black men. Aided by an eager news media—and such propaganda films as Reefer Madness —Anslinger eventually oversaw the passage of the Marihuana Tax Act in , which effectively made the drug illegal across the United States. Although declared unconstitutional in , it was replaced by the Controlled Substances Act the following year.

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Perhaps unsurprisingly, racism was also evident in the enforcement of the law. According to some studies, African Americans in the early 21st century were nearly four times more likely than whites to be arrested on marijuana-related charges—despite both groups having similar usage rates. Like our britannica stories? Sign up here to get more Demystified stories delivered right to your inbox! Health Econ. The efficacy of preemployment drug screening for marijuana and cocaine in predicting employment outcome.

J Am Heart Assoc. Probability and predictors of the cannabis gateway effect: a national study. Int J Drug Policy. Molecular mechanism for a gateway drug: epigenetic changes initiated by nicotine prime gene expression by cocaine.

Everything you need to know about marijuana (cannabis)

Sci Transl Med. Prior exposure to THC increases the addictive effects of nicotine in rats.

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Behavioural sensitization after repeated exposure to Delta 9-tetrahydrocannabinol and cross-sensitization with morphine. Psychopharmacology Berl. JAMA Psychiatry. Likelihood of developing an alcohol and cannabis use disorder during youth: association with recent use and age. Published online June 18, 2 — Department of Health and Human Services.

This page was last updated July National Institute on Drug Abuse website. July 24, Explores the latest research on marijuana, including the scope of marijuana use in the U. Skip to main content. Revised July Photo by NIDA. People call this practice dabbing.

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These extracts come in various forms, such as: hash oil or honey oil —a gooey liquid wax or budder —a soft solid with a texture like lip balm shatter —a hard, amber-colored solid These extracts can deliver extremely large amounts of THC to the body, and their use has sent some people to the emergency room. Compared to those who don't use marijuana, those who frequently use large amounts report the following: lower life satisfaction poorer mental health poorer physical health more relationship problems People also report less academic and career success.

Points to Remember Marijuana refers to the dried leaves, flowers, stems, and seeds from the Cannabis sativa or Cannabis indica plant. The plant contains the mind-altering chemical THC and other related compounds. People use marijuana by smoking, eating, drinking, or inhaling it.


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Smoking and vaping THC-rich extracts from the marijuana plant a practice called dabbing is on the rise. THC overactivates certain brain cell receptors, resulting in effects such as: altered senses changes in mood impaired body movement difficulty with thinking and problem-solving impaired memory and learning Marijuana use can have a wide range of health effects, including: hallucinations and paranoia breathing problems possible harm to a fetus's brain in pregnant women The amount of THC in marijuana has been increasing steadily in recent decades, creating more harmful effects in some people.

It's unlikely that a person will fail a drug test or get high from passive exposure by inhaling secondhand marijuana smoke. Marijuana use can lead to a substance use disorder, which can develop into an addiction in severe cases. No medications are currently available to treat marijuana use disorder, but behavioral support can be effective.

This publication is available for your use and may be reproduced in its entirety without permission from NIDA. Cigarettes and Other Tobacco Products. Electronic Cigarettes E-cigarettes. Marijuana as Medicine. Over-the-Counter Medicines. Prescription CNS Depressants. Prescription Opioids. Prescription Stimulants. Synthetic Cathinones "Bath Salts". Drugged Driving. Understanding Drug Use and Addiction. Nationwide Trends.

Medical Marijuana: Your Questions Answered and What We Know Today

Treatment Statistics. Lessons from Prevention Research. Substance Abuse in the Military. This series of reports simplifies the science of research findings for the educated lay public, legislators, educational groups, and practitioners. The series reports on research findings of national interest.

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Skip to main content. What is marijuana?

Prev Index Next. Contents Letter From the Director What is marijuana? What is the scope of marijuana use in the United States? What are marijuana effects? How does marijuana produce its effects?

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