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For alcohol, the cutoff is uniform: A blood alcohol concentration above 0.08 percent. But there is no standard cutoff for THC, the psychoactive compound in marijuana.
Cannabis use disorder (CUD), also known as cannabis addiction or marijuana addiction, is a psychiatric disorder defined in the fifth revision of the Diagnostic and Statistical Manual of Mental Disorders and ICD-10 as the continued use of cannabis despite clinically significant impairment.
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.
Over time, the marijuana gateway hypothesis has been studied more and more. In one published study, the use of marijuana was shown not a reliable gateway cause of illicit drug use. [67] However, social factors and environment influence drug use and abuse, making the gateway effects of cannabis different for those in differing social circumstances.
New research based on data from the National Survey on Drug Use and Health, published Wednesday in the journal Addiction, compares Americans' use of cannabis and alcohol over the past 40 years.
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The study found that "after adjusting for age, gender, race and alcohol use, drivers who tested positive for marijuana were no more likely to crash than those who had not used any drugs or alcohol prior to driving". [3] The study however cautions that "these results do not indicate that drug use by drivers is risk-free."
Alcohol is the most widely used recreational drug in Australia. [43] 86.2% of Australians aged 12 years and over have consumed alcohol at least once in their lifetime, compared to 34.8% of Australians aged 12 years and over who have used cannabis at least once in their lifetime. [43]