The one thing about vaping that is proving to be the biggest challenge: sticky finger syndrome. No matter what precautions I take, or how many vaper towels I use I end up with the 'transdermal nicotine delivery system.' Absorbing nicotine isn't as fun as vaping. Anyone master this technique? Doesn't matter if its protanks or carto tanks, there's always spillage. I'm wondering if tanks with fill holes are better.