Tiny packets of nicotine have quickly become a big problem for parents and schools. They’re available at gas stations and convenience stores under names like Zyn, O! Rogue, Juice Head and VELO ...

And some disposable e-cigarettes, now the top-selling type on the market, allow users to take thousands of “puffs” and contain as much nicotine as multiple packs of cigarettes.

Tiny packets of nicotine have quickly become a big problem for parents and schools. They’re available at gas stations and convenience stores under names like Zyn, O! Rogue, Juice Head and VELO ...

(CNN) — Tiny packets of nicotine have quickly become a big problem for parents and schools. They’re available at gas stations and convenience stores under names like Zyn, O! Rogue, Juice Head ...