To be fair, Oregon never reached the point of legal sales channels for drugs. Drug users still had to purchase drugs from a dealer. Their supply chains were the same as in other states.

Actual legalisation would establish a legal purchase channel. That would come with quality controls, et cetera.

Deaths from prescriptions were relatively rare - but it created a huge number of addicts with escalating tolerances.

Then as progressive efforts were made to reduce distribution, pill-mills and secondary markets appeared (i.e. crime). Then with further restrictions, addicts moved off oxy entirely, onto heroin, and then fentanyl flooded in - and bodies piled up.

Just "legalizing" might reduce the harm, but would increase number of addicts. Prescriptions for existing addicts is good for them - but dealers aren't just going to give up, they'll focus on creating new users.

I don't think I've ever seen a perfect solution - but things like distributing naloxone or creating supervised places to self-administer seem like no-brainers in the meantime. Resistance seems to come from a somewhat ugly place where people see users dying as the problem being solved.