Hello Squid . So you want to make your own electronic cig mod. Personally I dont think I would use a touch switch on one of those ,who suggested you use one of them ? .They can be pretty unreliable sometimes ,when you get grease/dirt on them they can sometimes start to fire on there own ,and you dont want that to be hapening with your E.cig . I would stick to using tactile switches only to be on the safe side .go here
http://www.e-cigarette-forum.com/forum/ and look into the "modding forum" section and ask there ,you will get lots of advice from other to help you .