A review of 20 years of marijuana research concludes there are real risks to using the drug, according to U.S. News and World Report. These include increased risk of car crashes, dropping out of high school and cognitive impairment. Marijuana does not produce fatal overdoses, the review notes.
According to the review, published in the journal Addiction, research in the past 20 years has shown that driving while marijuana-impaired approximately doubles the risk of car crashes. About 10 percent of regular marijuana users develop dependence. Regular use of the drug during the teenage years doubles the risks of dropping out of high school and of cognitive impairment in adulthood. “Regular adolescent cannabis users have lower educational attainment than non-using peers but we don’t know whether the link is causal,” the researchers note in a press release.