OK, this isn't my atty, but the husbands... he was happily vaping away last night when suddenly NO air was going thru. Still working on converting him, so just popped off the atty and put on a new one. Weird tho, as when the atty was attached, a draw pulled in no air at all, couldn't blow thru either. Atty removed, can hold it to mouth and blow thru it in either direction, and get air movement. So... what's up with this?