Part of the reason for the growth in teen vaping is that vaping liquid, known as vaping juice comes in many flavours.
The most popular flavours for adolescents & young adults is different in UK & US.
Other reasons for the surge in teen vaping is the lack of regulation (unforgivable given nicotine is a highly addictive drug) and because the vape industry have mercilessly targeted youngsters in their marketing and advertising (and been allowed to do so for over 10 years).