I'm not sure you the strict regulations on nicotine content would go. It might be almost close to impossible with tons of sites young people easily access nowadays. Just a quick search on Google can exactly tell them where are how to buy (like this site with tips about buying older models for cheap and buying vaping gears from CHINA). What I hate most about that is the danger those poorly made cheap ones bring (ever heard of exploding e-cigs?). Yikes
No system is perfect. The goal is to just make it as difficult as possible.