I understand. Again, from the purely medical, scientific perspective, I would be the first to agree; however, as you've said in your testimony, they're already using it in high amounts now, when it is illegal. It is already illegal and many of them are just not listening to the advice about it.
If you raised the age to 21, would you have any less youth usage of it? Would the people aged 18 to 21 be using it any less, if you put the legal age at 21, than they do right now, when it's already illegal and they're using it a lot?