If you don't mind smoking then go for it!
If you don't like it then don't date him!
you could ask him to maybe not smoke around you or something
but at the same time don't try and change him!
As for me, I do not like girls who smoke and I don't think I'll ever get used to It. And I don't want to have a relationship with a girl who smokes, this is not acceptable for me and I just hate it. Even when I chat with a girl on social networks or on online dating I almost immediately ask if she smokes. For example, recently I started talking with a girl on this site https://hookupmasters.com/adult-dating-sites/xmeets-review/ but then I found out that she smokes and we didn't meet in real life
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