Ah, but here's the twist, most of them are already officially "illegal" but are still sold mail order and in corner stores none the less. It is an enforcement problem, not a regulation one.

Also of note, the big tobacco manufactured brands like NJOY and BLU actually have pretty substantial testing done on them. I met one of the analytical chemists who does the testing. What is there tolerance level for metals? I dont know, but probably better than the Chinese import all-in-ones. Based on this data though, seems like D Pods are the best pick all around if you have to pick one, so big brand D Pods are probably best overall, but then they dont have the flavors the kids all clamor over due to actually following regulation.