Is it okay if my wife looks up and contacts old male friends/smoking buddies?

Only YOU can really answer that.
It's your choice and marriage.

You are asking US? Why not your wife?

What kind of smoking buddies? Cigarettes, hashish, coke, meth? I wouldn't like that myself, and would say so. Still she can do as she pleases.

I don't see how you can stop her. Good luck with that.