marijuana smoke iz different then tobacco. the smoke duznt cling 2 yer lungz az tobacco duz. if yer a rlly heavy smoker, uve prolly coughed up brownish coloured spit er even bitz ov tar. this iz yer lungz cleanin themselvez out sumwut. i dunno if they wood totally clean themselvez out er not, but quittin fer a while wood definatly help.
PeAcE