http://www.youtube.com/watch?v=8Md2W...mbedded#at=583
Heres some info on COPD and Lung Cancer in regards to marijuana "smoking"(refering to a study smoking joints, and this is still with the intake of carcinogens, which would be elminated if you used a vaporizer)
aprrox 9:01-22:00 mins mark. ;)
Thanks to Jason Mallory for posting this on another thread.