Even with the new laws, at least since I was a kid and smoking, it doesn't seem that our youth are being deprived of tobacco.
Using tobacco is perhaps the only thing we do that has NO useful benefits. There is nothing good that comes from tobacco use. Nothing! It is dirty, it smells, it ages skin prematurely, it causes myriad of health problems, it is addictive, it causes cancer, it is expensive, it harms people around you.
While restrictive purchasing laws have helped curb use somewhat and restrictive use laws (where you can't smoke anymore) have helped somewhat more, only education coupled with prohibitive cost seem to convince people that smoking is bad for you.
I vote for doubling and then tripling tobacco costs.