I don't know if it's actually dirtier than tobacco smoke birdgirl. Just check out this cannabis/tobacco comparrison from Erowid:

Erowid Cannabis Vault : Info on Smoke composition


Cannabis seems to win on most fronts.
mrdevious Reviewed by mrdevious on . asthma,lungs and medical weed Okay i know this might sound dumb to you, but i was wondering my lungs have been bugging me, because i would smoke ciggerettes on the weekend, a while back..and i have asthma. Yeah i know VERY stupid. But i was wondering if i smoke some more weed(medical) will it like help me sorta breathe better? Like will it clear out some stuff like mucus or something ? haha get baack at me. Rating: 5