Actually I talked to the guy at the local vapor spot and he said that prob 1/10 customers vape without nicotine, and the most popular strength was 18mg. It's possible there are lots of people who just don't do retail purchases and smoke w/o nicotine but i doubt it. pretty sure it's very rare to smoke NO nicotine, and personally I'm not sure why anybody would. It's far healthier than smoking but frankly there is zero possibility vapping is AS SAFE as not vapping at all.