I disagree. When it comes to something like drugs becominmg legal the parents moral authority goes out the window, the state has deemed it acceptable. Parents cannot stop their 18 yr olds from buying alcohol in most states. In a teens mind all they can think "well it's legal what do they know".
If you plan on a legal career or anything requiring a clearance then a pot bust is going to ruin it before you even start. Yes that is a consideration and yes teens do think like that. I did.
Buying alcohol at 18 is illegal in all states. And, if as a parent, you didn’t teach your child right from wrong and making wise decisions before he/she turned 18, you started way too late. That is not the state’s responsibility; that is your responsibility.
When you want the state to illegalize what you don’t want your kids to be tempted by, you live in a nanny state. How is that working out for you?