they're not, work fine on any non-apple device, (iPhone had a similar problem, although not as bad.) those devils devices have been collecting dust for a while now.
all of it, well mail works. I know I mainly used it for VLC which atleast 2/3 times I tried opening a file, my ipad would just restart, same with some apps.
iPad can't open anything, keeps crashing. (relatively new)
I'm a teen myself and so I hang around a lot of them, in my groups everyone smokes usually they started because of their friends and so on. its literally the standard in my field of people, and yes that's a field with a lot more mentally ill people compared to other groups. So I guess you are sort of right.
no teen i know vapes because of their mental health. right now, Here in germany, every teen I know smokes and occasionally (when having the money) vapes.Its the standard.
they are, but they probably also install a bunch of other stuff, I've had one once. had to reset my phone.