What to say to people who make themselves sick

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I am having an issue right now and I don't know how to deal with it. People in my family have a habit of bringing upon their own illnesses. For example, my uncle died from liver failure due to his excessive drinking. My aunt died of kidney failure because she did not correctly monitor her diabetes. Now, my mother is dying from emphysema due to her years of smoking. I do feel very sad that my mother is dying, but I don't know what to say to her. She expects me to pity her and feel badly for her, but she caused this disease. She knew the risks of smoking and still chose to do it. I want to comfort my mother and be there for her, but she portays herself as a helpless victim, which she is not. What should I do? I don't want to be cold to her. I love my mother, but I want to help her realize that her health was her responsibility and she should have taken care of it. How do I do this gently?