Donald P. Tashkin, MD, Director of the Pulmonary Function Laboratories at the University of California, Los Angeles (UCLA), responded when asked at the June 2005 meeting of the International Cannabinoid Research Society if "in at least one category [marijuana-only smokers and lung cancer], it almost looked like there was a negative correlation, i.e. a protective effect":

“Yes. The odds ratios are less than one almost consistently, and in one category that relationship was significant, but I think that it would be difficult to extract from these data the conclusion that marijuana is protective against lung cancer. But that is not an unreasonable hypothesis.”

[Editor’s Note: Prior to Dr. Tashkin’s June 2005 Con position above, his position was Pro as indicated in his Mar. 1997 statement in the opposite column.] June 2005