They're not. They've been banned in the UK for a while now. But I think the reusable ones are still cheap enough for people to be careless or just chuck them.

Welcome to another episode of regulation backfiring. People want disposable vapes, the government bans them, so companies find a way to provide technically rechargeable vapes that are disposable, now it creates even more waste, the customers suffer, the government pats itself on the back for making the world slightly worse. Tune in for the next episode: age verification for computing devices!