If they're actively trying to get off I'd wager their will to live is far stronger than you'd think. Regardless that wasn't the inference in your post.

Withdrawals aren't all that long.

Former addict, DT's will not kill you. You'll wanna die, but it just punishes you.

Alcohol and benzos on the other hand can absolutely kill you when coming off.

Decriminalization is in no way shape or form the drug being "legal" and certainly not able to be sold.

There aren't any states giving out opiates recreationally.