Now there's a philosophical question about free will. I won't go into that as I don't think people have free will as the term is commonly understood.
But plenty of people use drugs with full knowledge of its effects. Whether this leads to their demise depends on their ability to self-regulate and optionally support networks.
But the reality is that the truth is somewhere in the middle. There are oppressed people and there are people pursuing self-gratification, and there are people who are in the overlap. So there's no one size fits all.