Smoking weed is just as bad as smoking tobacco! In addition to all the usual carcinogens in cigarettes, cannabis smoke remains carcinogenic. Both are linked to cancer but bind to different receptors. Combined cannabis and tobacco smoking is even worse. Also note worthy, cannabis does lower your sperm count and quality in males. It does not damage brain cells as once believed. There simply is no evidence to show that happens unless a person smokes 200x the normal amount. It does however impair short term memory and also other portions of the brain causing individuals to not care as much how they look or dress, and dampen enjoyment in other areas of their life. All is short term and if some one stops will resume their normal state.

IMHO it would be safer to cook cannabis, same effect, less some of the carcinogenic.