I wrote the parent comment and mostly agree with you about personal choice @sneak, except 'Taking drugs doesn't affect anyone else'. Whether alcohol, weed, opia

I wrote the parent comment and mostly agree with you about personal choice @sneak, except 'Taking drugs doesn't affect anyone else'. Whether alcohol, weed, opiates or whatever substance abuse is hugely costly and damaging in modern society to those who don't have this disease. There is a strong argument for pre existing substance dependency condition in people but the toll on those around them is huge. You are smudging cancer and substance abuse together but in many cases complete abstinence in an individual due to awareness of a pre existing familial susceptibility can help that person to never become addicted because they are aware of the danger and biological weakness in themselves. 12 step programs etc can help people abstain if they become addicted although it is a huge and heroic struggle back to the surface. Sadly this is not the case with cancer.