December 3, 2009 – I attended the 1st National Clinical Conference on Medical Marijuana in Iowa in 1998. Arguably the most learned man on the subject of the effects of smoke on the lungs is named Donald Tashkin, Professor of Medicine, Division of Pulmonary & Critical Care, at UCLA. He spoke for almost an hour at the Conference, showing slides of smoke-browned lungs. He showed how marijuana smoke seems to push pollutants towards the outer lining of the lungs.

His presentation did not portray marijuana smoke as harmless, but there was no solid evidence of disease associated with the browning of the lungs’ outer lining. Donald Tashkin has conducted the most extensive research involving the largest number of long-term marijuana-only smokers, as well as multi-drug smokers–marijuana, tobacco, cocaine, and other substances, for several decades. His critique of marijuana smoke was completely non-committal. (Considering the government is his largest source of funding, there is little doubt why his lecture at the first medical cannabis conference was short and unsupportive.)

When Dr. Tashkin finished his speech, he did not wait to answer questions. He grabbed his materials and bolted for the door. I raced after him and stopped him on the steps outside the conference hall. I showed him the passages I had written about his research in The New Prescription. I stood there and watched him read everything I had written about his work. He agreed that my synopsis was correct. Then I asked him the $64,000 question. I said, “Do you know of any cases of marijuana-only smokers who had lung cancer?” He said “Yes, there is one.” Then he smiled, explaining, “He was sixteen years old.” We both smiled, knowing a teenager could not possibly have sufficient exposure to marijuana smoke to cause lung cancer–his cancer was clearly due to some other cause. By: Martin Martinez. Source.