damn dude wish i read this earlier. i've been battling a lung issue with my dr. for 3-4 months now (even quit smoking tobacco 2 months ago because of it and if you smoke cigs you know thats dire!) anyway i remember it wasn't too long after a "musky" smelling bag but thought to myself it couldn't be since the flame would kill it and everything looked okay. 20/20 hindsight your right, air particles not in the flame path would still pick up spores on the way down the pipe or even worse I'm a joint kinda guy so all the air is filtering through unsmoked herb. and water pipes only filter 15%?!?!?! i see the dr. again next week (more bloodwork/x-rays) and i'll tell him i was dealing with hay bails at the farm or something see if that helps him with a diagnosis. antibiotics seemed to work but still not 100% and i don't even smoke cigs any more. and yep, i'm back to the good stuff so guess i need to do better to make it last this time so i can keep the qc process in house ;-) i think i do a better job than "my backup guy" does that's for sure!