This rather complicated study looks at the “gateway theory” through data collected from 510 pairs of twins who participated in a very large, long-term health study — and the gateway theory doesn’t emerge with much backing. The authors write,...
Oxford University pharmacologist Leslie Iversen reviews the literature on the effects of long-term marijuana use. Iversen finds that most purported cognitive impairment associated with cannabis dissipates when use ceases. While acknowledging there are some likely...
Schizophrenia, a chronic mental illness, is often accompanied by poorer cognitive functioning, and some research has suggested that marijuana may worsen schizophrenia. But this case-control study shows enhanced cognitive functioning in schizophrenic subjects who use...
Neil T. Smith, “A review of the published literature into cannabis withdrawal symptoms in human users,” Addiction 97, issue 6 (June 2002): 621-632. We hear regularly from prohibitionists that marijuana is addictive, but some experts consider the evidence unconvincing....
J.C. Suris et al., “Some Go Without a Cigarette: Characteristics of Cannabis Users Who Have Never Smoked Tobacco,” Archives of Pediatric Adolescent Medicine 161, issue 11 (November 2007): 1042-1047. This study examined differences between youth who use both tobacco...
