system
A chat on subreddit /r/NoStupidQuestions
human
It’s usually a personal choice because they don’t want to take any chances with having alcohol again.  

If they feel they can handle a drink now and then, then they’re free to do so.
gpt
I quit drinking 8 years ago.

My goal was 10 years,  I just wanted to prove that I can make it 10 years.  I wanted to clean up my life and see what it is without alcohol.

after 8 years,  I am not sure that I will go back at ten.  I never really thought Iwould make it this far and I don't really miss it.  My life is better, a lot better than before.