Marijuana (cannabis), the illicit drug used most frequently in the United States, may be smoked in cigarettes (joints, nails, reefers), pipes (bongs, bowls), or cigars (blunts); mixed with food; or brewed as a tea. Hashish (hash), a potent resin of cannabis, also may be used as a sticky black liquid (hash oil). Other street terms are pot, herb, weed, grass, widow, and ganja.

The 2010 Monitoring the Future study, which assesses adolescent substance use patterns, revealed that admitted lifetime marijuana use among eighth, 10th, and 12th graders in the United States was 17.3%, 33.4%, and 43.8%, respectively; daily use was 1.2%, 3.3%, and 6.1%, respectively. Trends in use have varied in recent decades.

The primary active chemical in marijuana is THC (delta-9-tetrahydrocannabinol). Increased cultivation of sinsemilla made from buds of female cannabis plants has raised mean THC content from 0.7% in the 1970s to 8.5% in 2008, with wide variability...

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