Ermz
¯\(°_o)/¯
As I said...I ask clients before even going near the weed box.
~006
If I were a client I would feel quite uncomfortable making such an imposition on the engineer. Because as far as I see it, I'd be a guest at the studio and for the engineer to ask me 'do you mind if I smoke?' would mean incredibly bad inter-personal vibes if I said 'no, I'd prefer if you don't'. You don't want working relationships to start off on a bad note, so you basically just go with the flow.
I've heard of quite a few facilities around here using weed to pacify and make clients more agreeable. Somehow money seems to disappear quicker when weed is involved, which can be a great thing for the studio operator. So when you say your place is a weed free-for-all, that's the only image that comes to mind, for better or worse.
I just find the whole thing highly unprofessional. Nothing personal of course, but I value a straight work ethic. Pets, family members, spouses, girlfriends, drugs etc. are not welcome.