No problemos with the airflow bro...and I smoke tobacco too...You worry over nothing! Keep tokin! The Indians used to use it as a treatment for asthma...it helps break up the goo in your lungs and makes you cough up the bad crap in there and keeps em clean! It won't get you high and it tastes nasty, but Sage will do the same thing when smoked...I'm too old to go run marathons anymore anyway...not that I ever did...At 55 I still have the stamina I did at say 35? My lungs feel great tho! Personally, I credit the weed for letting me smoke tobacco for so long without any problems... so far anyway!:stoned: