i have been vaping for 12 months now. everything was going great untill the other day. i have always cleaned my attys when they needed it. now i have very little vapor coming out. the atty seems to heat up just fine and i hear it "sizzling" so i am pretty sure it is heating up enough. but i have to pull really hard on it. i have tried different attys and a couple batteries both auto and manual. the only way it works good is when i have my PT on. any ideas? i am starting to get frustrated. i cleaned them with mouthwash and 70% isopropolyne.