I would choose to avoid supporting their habit. I would not buy cigarettes or things I don't consider to be food (twinkies, liquid cheese in a can, sugar & flavor chemicals on a stick, or other highly processed non-food junk).
On the other hand, I'd have no issue adding cheese to something I'm fixing for a family member who loves cheese even though I have chosen to stop eating dairy because I don't like the effect it has on my body. Perhaps this is because I have no moral objection to dairy, and I'm not convinced that it's universally bad. Within the category of organic, whole (or minimally processed) foods, I think what works from person to person varies.
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