They went back to cigarettes.
Mission accomplished I guess.
Furthermore it is much more socially unacceptable and awareness of the harms of cigarettes has never been higher.
Insofar as teens if eciggs were to become as hard to get as heroin tomorrow nicotine addition of teens all cause would be liable to decrease because your mom is absolutely going to know your smoking actual ciggs and have something to say in the matter.
I once knew an adult smoker who smoked about 1/2 a pack a day. She also didn’t want to smell like it, he had methods she employed that would leave absolutely no smell on her.
If your kid wants to hide smoking analogs then they can easily, just stand in front of a fan and wash your hands and face after.
What you say is correct you could certainly decrease the chances of being caught but on net out of 100 smoking teens 90 will end up getting caught trying to smoke real ciggs whereas hiding a non scented vape is so extremely trivial that the situation is reversed. 90 will escape detection.
There is a distinct difference between those two circumstances.