The Independent, Is Smoking Marijuana Dangerous? A review of research of the last 20 years says it is

UntitledA newly published paper reminds health professionals, policy makers, and the public, of the potential acute and long-term risks of cannabis use.  In his report, Professor Wayne Hall at The University of Queensland Centre for Youth Substance Abuse Research, considers how the evidence has evolved over the past 20 years. He points out potential risks, both in the short term, and higher risks for three settings: long-term heavy use, use in adolescence, and during pregnancy.