i smoke around at least 2 grams daily....and sometimes up to a 1/4 on weekends...(got a kick ass job) and my lungs i think have just built up....i started smoking cigs at twelve and weed at 12 or 13.....they just get stronger and stronger....i smoke more and more but im not getting as high as i used to i know....which sucks. but they just build up after years of smoking.