no answers for you here, but could it be the type of mj that you smoke? ive had no such problems whenever i hit the bowl or at least ive never noticed. i havent hit it in a while since started flushing but since then my roomate just purchased a vaporizer which is suppose to eliminate alot of the impurities. it set him back $500 but if youre serious about healthy/clean living, it may be a solution for you. he got the volcano. i havnt tried it yet since im in the middle of something big. after thats done, its volcano time, all the time.