I had my baby when I was 17 as well, and I can relate to not being able to know where 'the line' is drawn. Especially since humans are such social creatures, there is definitely some unintentional peer pressure when your now-legal friends are doing drugs and expanding their minds and partying. It's hard to say no every single time, especially when the risk (for some drugs) is so slim.

I figure as long as they're being cared for by another responsible adult (like your partner, their grandparents, or their other parent- someone who you'd trust to handle an emergency) for at least 24 hours after you do long-lasting drugs it's probably okay.

Also, you must be SO VERY diligent in two ways- first, making sure all trace of the drugs you consumed is wiped away, any 'extras' should be placed in a lockbox or safe your children cannot access. This is especially important for teenagers and very young children. Also, to be very diligent about not forming habitual drug use behaviours and that some drugs are to be avoided at all costs.

I think pot and alcohol are fine to use in moderation at home once kids are in bed, as long as there's another responsible sober adult there with you.

I had a few sips of alcohol and I'm not... against it per se, but I probably wouldn't offer it to my son until he was 16+. One of life's great mysteries is it isn't clear whether or not allowing your child access to alcohol early on teaches them to be responsible about alcohol or only normalises it's usage in a way that could be abused later. Personally I think it depends on too many contributing factors. I'd prefer for him to drink under my supervision because young men do very, very stupid shit while drunk and under peer pressure to do something stupid. I'd rather him drunk but safe at home than drunk and vulnerable out in the world.