In most states, minors can buy e-cigs.
E-cigs are being marketed broadly, using techniques designed to reach kids, teens, and young people. From candy and fruity flavours to celebrity pitchmen, TV spots, social media and "underground" marketing with free samples at events and clubs.
The industry, which now includes tobacco companies, is trying to get as many users hooked as possible in the 1 to 2 years before the FDA is expected to have final regulations for the products. So they are pulling out all the stops now.
E-cig sellers jockey for market position before FDA issues regulations
http://parenting.blogs.nytimes.com/2013/09/06/e-cigarette-marketers-have-an-eye-on-teens/