after reading things about pg pulling moisture out of the air, and people claiming to be dried out from using them tipped me off to this, after noticing 2 things. first, i was sitting with a hot cup of coffee, and as i blew a thin stream, when it hit above the cup, a bunch of vapor appeared. next, i took a shower(hot with the door closed), got right out and hit my cig..plumes. so, i think it may be humidity levels that affect vapor production. it seems to need moisture in the air to make vapor. i was wondering why some days i get great vapor, and others low vapor.some people were suggesting temperature as the factor, which could be, but im thinking its moisture, since the temp. has not changed in my house by much, but humidity levels have. if anyone has ideas to test this theory better....