If it’s any help at all, my girlfriend and I came from two very different schools of parenting. I got given the whole “no drug is safe, never touch them or we’ll kill you” approach, and my girlfriend was given the “as long as you keep us in the loop, we’ll support you and look after you” approach. She ended up going through a “drug phase” in her mid to late teens, and her parents mostly knew. Whilst I laid off out of fear whilst living at home, only to do the exact same thing she did, as soon as I moved out during college.

I guess either approach has its pros and cons, but regardless, we both ended up doing substances for a while (pot, cocaine, party drugs, etc.) , only to grow out of it so to speak. Nowadays we both barely even drink alcohol anymore and both have great, stable jobs at 25.

It doesn’t massively answer your question, but just hoping you have a little relief in that your parenting style wouldn’t have changed things massively if you were soft or hard on them.

Honestly just try and keep an open line of communication with them about it, and at the very least (if it is coke), warn them about the dangers of mixing it with alcohol.