I'm honestly just a coward; I have no idea what's actually in drugs that people buy on the street, and if I get sick, what exactly am I going to do? Sue them?

I'm honestly just a coward; I have no idea what's actually in drugs that people buy on the street, and if I get sick, what exactly am I going to do? Sue them? My dad is an outlier who managed to never have any issues thankfully, but there is a pretty strong history of addiction (mostly alcoholism, but other stuff too) on my dad's side of the family, and as such I've always treated drugs pretty cautiously.