Yes, I'm quite familiar with Dr. Tashkin and his research, too. It's because of that--and because of the fact that there's evidence of cellular damage (evidence of DNA damage, they believe, too) and the link to respiratory problems--that I think people would be wise to be cautious. I'm fully aware of the apparent protective benefits against lung cancer. It was also not found to be associated wtih any increase in head or neck cancers, which are also common with people who smoke cigarettes. I'm just saying mild evidence of cancer protection--and remember, the Tashkin study was only with 1,600 people--still doesn't necessarily translate into unquestionable pulmonary benefit under all circumstances. No weed smokers ever cite any of the other studies that have been done, and they certainly can't speak for what other people experience first-hand, including doctors who see weed (and other) smokers.