The only proposals I've seen to attract serious attention are laws requiring e-cigs to be restricted in the same way cigarettes are. Legally requiring you to take your battery-powered glass dick outside is hardly making it illegal. That said I think laws restricting cigarette use are also too intrusive. In particular, I find requiring bars and restaurants to ban their patrons from smoking--which largely results in their patrons leaving--has had a negative effect on those industries in places where those bans are in effect. All that said, if making vaping illegal would upset hipsters so much, I may have to burn my libertarian party membership card because that's a nanny law I could get behind.