econically feasible, i like that! i was looking at emphysema suposedly caused by weed a few days ago and yer right, marijuana dosent obstruct the small airways like tabacco does, however what the info i read said was that because the force at which the weed smoke is sucked into the lungs is far greater than drawing on a cig, and also the time the smoke is kept in the lungs, means that weed smoke 'blasts' hole in the lungs. this leads to a differnt type of emphysema known as vanashing lung symdrome. while the bottom of the lungs remains intact, the upper parts simply turn from avioli(healthy airsacs) into cysts where the airsacs once were. check it out on google if yer dont belive me. if that doesnt presude you to invest in decent vaporizer, nothing will!