That's an old study based on limited information. Its primary value at this point is that it encouraged more research, which found that, yes, smoking marijuana

That's an old study based on limited information. Its primary value at this point is that it encouraged more research, which found that, yes, smoking marijuana DOES increase rush of lung cancer. For example, a slightly newer study http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2516340/ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2516340/