Can smokers and daily coffee drinkers be good candidates for veneers?

I'm at the beginning stages of researching dental procedures for my father who would like to replace/ repair his upper front teeth; his two front teeth are almost completely rotted away. He is a smoker and a daily coffee drinker, and I don't see this changing anytime soon, but can he still be a good candidate for dental surgery? If so, what kind of surgeries should I look into that would be best for someone like him? Can he have veneers if he is a smoker? Thank you very much for your time! :)