I think the idea is more to get in there before they're legally allowed to buy them anyway. If they're already addicted, they got them some other way anyway and

I think the idea is more to get in there before they're legally allowed to buy them anyway. If they're already addicted, they got them some other way anyway and this makes no claims to make that harder. But if I had to go beg my dad or older sibling every time I wanted to drink (as an adult) I probably just wouldn't do it much and not develop the tendency. You've gotta really want it. That, or the exact opposite happens and it becomes more desirable through exclusivity.