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A 2012 review of cannabis use and dependency in the United States by Danovitch et al said that "42% of persons over age 12 have used cannabis at least once in their lifetime, 11.5% have used within the past year, and 1.8% have met diagnostic criteria for cannabis abuse or dependence within the past year. Among individuals who have ever used ...
heavy cannabis users — used more than 1,000 times over their lifetime moderate users 10 to 999 times used during their life nonusers who used cannabis less than 10 times.
The short-term effects of cannabis are caused by many chemical compounds in the cannabis plant, including 113 [clarification needed] different cannabinoids, such as tetrahydrocannabinol, and 120 terpenes, [1] which allow its drug to have various psychological and physiological effects on the human body.
Cannabis use disorder is diagnosed when a person has two or more of such symptoms as craving weed, becoming tolerant to its effects, using more than intended, using marijuana even though it causes ...
Using marijuana as little as once per month is ... adds to the growing body of evidence suggesting marijuana may be harmful to the cardiovascular system. ... as 1 in 5 people over the age of 12 ...
Longitudinal studies over a number of years have enabled researchers to track aspects of social and psychological development concurrently with cannabis use. Increasing evidence is being shown for the elevation of associated problems by the frequency and age at which cannabis is used, with young and frequent users being at most risk. [24]
The January 2022 review looked at studies on over 43,000 people and found a negative impact of tetrahydrocannabinol or THC, the main psychoactive compound in cannabis, on the brain’s higher ...
In 2014, surveys said daily marijuana use amongst US college students had reached its highest level since records began in 1980, rising from 3.5% in 2007 to 5.9% in 2014 and had surpassed daily cigarette use. [46] In the US, men are over twice as likely to use marijuana as women, and 18–29-year-olds are six times more likely to use as over-65 ...