Hahaha You can't hold any study to be true. This is America... no citizen knows anything when it comes to any type of government. The only facts that we know are from experiences and "certain" history. I would fully agree that cigarettes are much more harmful than pot. And no... my Mom didn't get "leafy" pot, but she did smoke it regularly for 30+ years.. which caused the Emphysema. but than again, doing nearly anything regularly for 30+ years will cause some type of problem, especially medication.