I couldn't care less if someone wants to smoke themselves to death.

do you really truly believe this? would you say this about your parents or loved ones if they were smoking a pack a day and had emphysema and lung cancer? You wouldn't stage any kind of intervention to try and get them to quit and get them help? If they kept smoking, you wouldn't take their cigarettes away from them?

I extend the care that I feel towards my immediate loved ones to society at large. I am deeply saddened by deaths of despair, of millions of people killing themselves slowly with alcohol, tobacco and opiates. I don't think it's right to let them die without trying to help, just like I don't think it would be right to let someone you notice struggling to swim drown right next to you. We have obligations to love and help each other, and I would never let a loved one drink themselves to death if I could help it, so why would I let my fellow humanity do it just because I don't personally know them?

Libertarianism, individualism and voluntarism that you espouse completely ignores human interconnectivity and our obligations and duties. It pretends there is no obligation or duty to society.