I smoked about a PAD, and when I was using the e-cigarillo I might have used 18, but I've been at a steady 12 since I got my first KR808's in 2010, and I just started DIYing, so I'm bumping it down to about 10 right now with no problem... will probably move down to 8 for the next batch. I made a mistake and filled a carto with a friend's 24mg once and thought I was going to be ill.