New answers tagged lifnei-iver
It seems that R' Moshe Feinstein allowed one to provide fire/matches to a smoker, and did not think of this as lifnei iver. Igrot Moshe, Yoreh De'ah part 2, 49 (last sentence): Find more about this subject here.
There's good news, and there's better news. The good news is this has happened to many others before you, and the better news is not to worry about it. (Well, try to educate yourself and be more careful, but it needs no atonement.) As Fred noted in his comments, as long as the dairy was a different meal than the meat, you've satisfied the bare-minimum ...
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