I carry a lighter with me when I go out to the bars just to light up girls smokes. It's an easy way to break the ice with the girl across the bar or whatever. I don't smoke anymore, don't even like the smell of it anymore, but I'll pull out my vape and chat with them while they smoke away. If they are curious about my e-cig then I'll let them try it, tell them about all the benefits over smoking and whatnot. If they like it they like it, if they don't, oh well, I am a happy guy either way.
An evangelical vaper...go for it...if it works it is a come to Jesus moment!