So, here is my problem: if the sakler family or drug cartels deceived regarding the harmful and addictive nature of drugs, sure thing, hang them for murder! But if an adult human makes a conscious decision, being fully aware of the consequences then it that person's responsibility.

I think you should instead be angry at the government. Your friend should have been able to go to a facility that administers fentanyl or heroin safely while making available counseling and any other help that could be provided to him.

If there is a dosage for any substance where it can be administered without causing near-term death or irreparable physical damage, the government should either ignore it or intervene by implementing safe ways people can can consume these substances. You shouldn't need to go to a street dealer, even if you don't have a medical perscription they should let you get addicted and consume it if you choose to do so against all advice.

Millions die in the US every year because... I don't even know why? It sounds not right to treat people?