Not at all. My experience in this case indicates that there is a correct behavioural pattern which avoids the issue entirely and requires zero government's intervention.
But if you insist on having a regulation, okay, I'm fine with it. What about the following regulation: each time a minor is found gambling or smoking, his/her parents are fined 100x times the stake/the price of cigarettes?
So now you've made it impossible to actually stop a child from smoking. They're free to smoke as much as they want, because it's the parents that get punished, not them. And regardless of who gets punished, the fact remains, they can go to the store and buy cigarettes.
You really think not being given money by parents is going to stop kids from accessing smokes?
But if you insist on having a regulation, okay, I'm fine with it. What about the following regulation: each time a minor is found gambling or smoking, his/her parents are fined 100x times the stake/the price of cigarettes?