It’s totally a selection bias: if someone is doing drugs but isn’t running around screaming half naked in the street having a fent crisis, you would hardly notice them would you? It is for the same reason that homelessness has been wrongly equivocated with drug addiction (you don’t notice the ones that aren’t shoplifting to support their habit or having a crisis on the street for one drug related reason or another).

Surely there are adults and kids doing this in their homes, and we usually don’t notice them until a tragedy occurs (eg a teenager tries fent for the first time…and they are dead).