Great to get this out there but remember all parents were teens at one time.
Drugs are not a new invention every generation had drugs of some kind, sure the ones now have more variety and more kick but the peer pressure , insecurities and disconnect between parents and teens have been around forever, Times have changed but humans haven't.
Just remember that the answer is always Love even if that seems to be the hardest way. Love yourself first and remember the stuff that looks like mountains now will look like ripples in the sand when you look back.