yeah my friend was like hey sam you need to quit smoking weed it has alot more tar than even cigs and will clog up your lungs, my retort: "Well my ignorant little friend Delta-9 Tetrahydrocannabinol actually dilates bronchial passageways in your lungs allowing them to clean themselves better thus REDUCING any buildup of tar in the lungs" (doc even told me that my lungs are like a non smokers (except for my cillia being almost desroyed from heat) and i smoke a half oz every 3-4 days almost