NO problems at DTW, SFO, HNL, LAS, or MSP. Vaped like I owned the place. I was more cautious at PHX, the TSA were like storm troopers there. I've also discreetly vaped my way on planes from Michigan to Hawaii and back, and Michigan to Las Vegas and back. I have only one blog, Vapes on a Plane. Worth reading if this topic interests you, and there are some other internet reference links in there. I think being respectful of others, while not looking sneaky, is the key to acceptance and the potential for public awareness of your rights to this activity.