When I worked at a commercial greenhouse, my boss was regularly offering me herb, but I didn't smoke at the time. Silly silly me.
Now that I have a job in academia, I'd be shocked but not terribly, and olny because of my boss specifically... you'd be surprised at the number of very straight-laced and even stuffy looking academics who are closet "Chronisseurs".
I would at least insist that he have some of my stash of honey mustard onion pretzel shards, because I've always thought he was a tiny little wisp of a thing and needs some fattening up!

Oh! And Edit, I would insist that we follow proper lab safety procedures and smoke away from the solvent storage, wear personal protective equipment, and use the bio hood so as not to offend others who might not enjoy the smoke so much.