I will only provide a few references, and let readers check them out. Participating in arguments on this subject is futile. Those who care don’t need the arguments. Those who don’t won’t listen. So, here are some places to check out.
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This is just a small sample of references. Addiction is serious. Does withdrawal constitute illness or pikuach nefesh? Ask your LOR.
The discussion about assisting someone to commit an issur is a major issue.