I told my kids similarly, but, my own brother was killed by police when he was 19 (I was 18), due to drugs...cocaine sales and an armed weapon, to be specific.
That was harped into their minds from a young age.
As was the fact that I loved my brother ALWAYS, I miss him, and wished he was ALIVE to have been able to be their uncle.
Tragically, I think that my sad story hit home much better than just saying “don’t do it, even if it makes you feel good.”
They are both drug free and have no intention, from what I can see, to get involved with it or people who do it.
You have private mail.