My father taught me not to judge others. He would never offer advice (you should do this, or that) unless that advice was sought. He never judged anyone else for what they accomplished, or did not. He was a simple guy, what you saw, was what you got.
Unfortunately, he died of alcoholic cirrhosis when he was 69. Some people asked me "why didn't you try to change him?". My answer, he would have rejected any and all attempts from others "telling him what he should, or shouldn't, do". He was a smart man, he knew what he was doing (somewhat). I miss him dearly, however I know in my heart that there was nothing I could have done or said that would have ultimately changed the outcome.
He only quit smoking because it became prohibitively expensive on his fixed income.
Moral of the story, is: live and let live. Sometimes it is difficult. If someone asks you for help, help them in the best way you can. If they don't ask for your help, let them lay in the bed they make for themselves.