I just wrote a huge reply, & the site logged me out, so I am trying again.
I do not smoke weed, but dont have a problem with people that do. I do however smoke cigarettes. I will smoke the occasional cigarette in the house with the door open or right by a window.
I do not think any type of smoke is a good thing for bunnies or any animal or human for that matter to inhale. Us as humans have the choice to be around "smokers" for the most part anyways.
A little off topic, but along the same lines. Im going to tell you guys what happened to me this past July. I had a house fire & I "had" three bunnies. Two of my bunnies - Kiwi & Papaya were not in the direct line of smoke. They still ingested a ton of smoke, but not as much as my dear little Cookie. Cookie was in a different pen then Kiwi & Papaya because she was just coming 6 months of age, & I was waiting until she was spayed to try & bond the three of them together, or get her a friend if that wasent possible.
The amount of smoke Cookie inhaled was atrocious. When I pulled up her blankets, the carpet was white underneath, & brown where the smoke had traveled. All three got out of the house. I ended up taking them to my vets house- who is also my good friend, & bunny vet. She let me stay there with the bunnies.
I set them all up as normally as I could. I tried to keep their routine the same, playing with them, letting them out to run, feeding, cleaning etc. Kiwi & Papaya settled in quite nicely & quickly. I think because they had each other to snuggle up too, helped a lot. Cookie only had me, & I did spend as much time with her as I possibly could. Plus, my vet friend, would spend time with her too when I couldnt.
Anyways, Cookie never really settled in. I do believe she was tramatized or had PTSS, if thats even possible in bunnies. She was happy to see me & my friend, but was never quite the same bunny she was before. About a week after the fire, I always got up for 9am to feed, clean etc. She ate normally, played, & had pooped normally overnight. No reason for concern I thought. So I showered etc, left the house around 11, & got back around 3pm. She had not moved from where i left her. She had peed herself & was soaked from sitting in it, didnt eat any hay, & there was no poo. I picked her up, she peed on me - which she had NEVER done before. Immediately, I took her upstairs with all my meds on hand (simethicone, cisapride, metacam). My vet & medicated her. I offered critical care (which she loved), no change within the hour, & her breathing was getting very fast, so we rushed her to the clinic (it was a sunday). Took xrays, didnt see anything, so we were going to put her on IV fluids, & take her back home & monitor her for the night to see if that would help. We though she was in stasis. As we were trying to put the IV in, Cookie was literally dying in my arms, gasping for air, & trying to jump from my arms.
We opted to euthanize her on the spot because she was in EXTREME pain. My vet asked me if she could do an autopsy on her to see if she could see what the cause of her death was. I said yes, but didnt stay to watch. It turns out, Cookie had a complete torsion of her stomach. It was completly flipped upside down, & even if we had taken her to the clinic at 3pm when I got home, changes are, she would not have survived the surgery, or if she did, would have died shortly there afterwards. GI surgery on bunnies is very risky, as is any bunny under anesthetic.
My vet said this was probably due to the stress of the fire, smoke she enhaled, & being moved to a new environment.
In any case, im sure the smoke your bunny is inhaling isnt near as much as my little Cookie did, however, my point is that, I do not think any type of smoke for bunnies is good at all.
Sorry for the novel, but just thought I should share my story, on smoke & bunnies.