I am hoping some of the more experienced people can help me. I have been vaping for a while, although have not completely given up the analogs yet. So far went from 2 packs a day to about 5 to ten a day. Anyway, i was getting really frustrated with my M402. My favorite flavor is coffee which I mixed myself with 36 mg PG, VG and Lorann coffee flavoring. The lorann coffee flavoring seems to be thicker than all the other flavors and a lot darker in color. I just put on a new atty and a lemonade juice and wow, what a difference. Vapor galore and a drag that is exactly like a real ciggy. So it has to do something with the flavoring I would think. i think the dark thick coffee flavoring is clogging my atty to the point where it is really hard to get a hit out of it. you guys think I need to water down the coffee oil or should I try a different manufacturer? I would think that the dark oils produce enough residue to clog the atty. Do I need to stay away from the dark liquids all together?