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Marijuana users also smoke tobacco

In a recent report, ninety percent of cannabis (marijuana) users also smoke tobacco, said Arpana Agrawal, an assistant professor of psychiatry at Washington University in St. Louis.

Co-occuring cannabis and tobacco use is significantly more likely to cause cannabis abuse and dependence than only cannabis use, according to a paper by Yale researchers accepted by the peer-reviewed journal Addiction last month.

Psychiatry postdoctorate fellow Erica Peters said that both simultaneous use — in the form of blunts, marijuana in a cigar wrapper — and use on separate occasions make cannabis more addictive. Co-occuring use also intensifies psychosocial problems, such as anxiety, depression and legal difficulties. The study found that adolescents were less likely to have good grades and more likely to have drunk alcohol in the past month.

More info here: http://www.yaledailynews.com/news/2012/mar/20/tobacco-increases-weed-risk/.