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Marijuana overactivates parts of the brain that contain the highest number of these receptors. This causes the "high" that people feel. Other effects include:

altered senses (for example, seeing brighter colors)

altered sense of time

changes in mood

impaired body movement

difficulty with thinking and problem-solving

impaired memory

hallucinations (when taken in high doses)

delusions (when taken in high doses)

psychosis (when taken in high doses)

National Institute on Drug Abuse. “Marijuana.” NIDA, N,

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The Truth About Drugs Documentary - Marijuana

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Among persons aged 18 or older who reported lifetime marijuana use, almost 53 percent report first using marijuana between ages 12 and 17. About 2 percent report that they first used marijuana before age 12.

In 2010, 21 percent of high school seniors used marijuana in the past 30 days, while 19 percent smoked cigarettes.

Nineteen percent of teen drivers reports they have driven under the influence of marijuana.

Marijuana accounts for 17 percent of admissions to treatment facilities in the United States, second only to opiates among illicit substances.

Morin, Amy. “Statistics on Teenage Marijuana Use.” Verywell Mind, LCSW, 24 Dec. 2017

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When a person inhales the smoke from a joint or a pipe, he usually feels its effect within minutes. The immediate sensations—increased heart rate, lessened coordination and balance, and a “dreamy,” unreal state of mind—peak within the first 30 minutes. These short term effects usually wear off in two to three hours, but they could last longer, depending on how much the user takes, the potency of THC and the presence of other drugs added into the mix.

National Institute on Drug Abuse. “What Is Marijuana?” NIDA, National Institute of Drug Abuse,

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Marijuana can be smoked as a cigarette (joint), but may also be smoked in a dry pipe or a water pipe known as a “bong.” It can also be mixed with food and eaten or brewed as tea. These are called “edibles” and are covered in detail later in this booklet. Sometimes users open up cigars and remove the tobacco, replacing it with pot—called a “blunt.” Joints and blunts are sometimes laced with other, more powerful drugs, such as crack cocaine or PCP (phencyclidine, a powerful hallucinogen).

“What Is Marijuana? How Is Marijuana Used? Street Names for Marijuana - Drug-Free World.” Foundation for a Drug-Free World, Foundation For a Drug Free World,

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Marijuana—also called weed, herb, pot, grass, bud, ganja, Mary Jane, and a vast number of other slang terms—is a greenish-gray mixture of the dried flowers of Cannabis sativa. Some people smoke marijuana in hand-rolled cigarettes called joints; in pipes, water pipes (sometimes called bongs), or in blunts (marijuana rolled in cigar wraps).¹ Marijuana can also be used to brew tea and, particularly when it is sold or consumed for medicinal purposes, is frequently mixed into foods (edibles) such as brownies, cookies, or candies. Vaporizers are also increasingly used to consume marijuana. Stronger forms of marijuana include sinsemilla (from specially tended female plants) and concentrated resins containing high doses of marijuana’s active ingredients, including honeylike hash oil, waxy budder, and hard amberlike shatter. These resins are increasingly popular among those who use them both recreationally and medically.

National Institute on Drug Abuse. “What Is Marijuana?” NIDA, National Institute of Drug Abuse,