Hey so I’m going to address specifically the marijuana itself rather than the smoke.
I live in Canada where we’ve legalized weed for human usage, our medical consensus is that as long as your brain has finished developing, it’s essentially harmless. It has many benefits for pain relief, anxiety relief, and more.
I also work in veterinary and animal care, and so this is not my opinion, this is the medical ruling that I have been taught BOTH by veterinarians and people selling marijuana derivatives FOR PETS.
(That said I don’t do marijuana myself and probably never will—the smoke at least gives me an INSTANT migraine if I get a whiff of it. Thankfully Canadians have been very respectful about not smoking excessively in public. Drugging people without their consent is not okay.)
Marijuana has two primary chemicals that give effects humans enjoy: THC, which is what produces the “high”, and CBD, which provides pain and anxiety relief.
THC is very toxic. Humans are living garbage disposals, and can handle that. Understand, any sort of high is a chemical that has toxic effects interfering with your body and brain functions. Alcohol is a toxin—that’s why your liver filters it out of your blood, because your body goes “hey this is interfering with how we’re supposed to work!!” And tries to make it go away.
There are a TON of things that humans can consume safely that animals cannot, because we aren’t the fastest runners and we don’t have the sharpest teeth and we don’t have the warmest fur but BY GOD are we durable. Onions, peppers, alcohol, opium, there’s a laundry list of toxins that organisms developed to STOP animals from eating them that we voluntarily ingest because we enjoy the feeling of toxins in our body. Humans are living garbage disposals with livers made of STEEL.
THC is one of those things. Since marijuana was legalized vets have been seeing a TON of pets coming in with marijuana overdose—usually dogs, as they ate discarded joints they found on the ground on their walks.
So unilaterally I can say—please do not allow your bunny to breathe in marijuana smoke. The toxic effects breathing smoke has on the lungs aside, the THC that is in the smoke is not good for them, and it would be very easy to overdose. Dogs coming in with marijuana overdose are vomiting excessively in an attempt to get the toxins out of their body—rabbits can’t vomit. Don’t let them breathe the smoke, don’t let them eat the plants, just don’t do it. Not only is the THC toxic in a way their bodies aren’t meant to handle, but they are so small and their metabolism is so fast that per weight, their overdose point will be a LOT higher.
Now! I did mention that people do sell marijuana derivatives for pets. That’s because the second chemical, CBD, is not very toxic at all. It might be a little toxic, we haven’t totally nailed down the exact level of toxicity, but it’s not toxic to a level that is dangerous for (probably most) pets.
(This is a bold new frontier, we can’t say anything with certainty yet.)
And CBD, as you’ll recall, is for pain relief and anxiety. I have seen CBD oil work actual wonders for dogs and cats. I personally know of three different people who are successfully controlling their dog’s seizures with CBD oil. CBD oil has given elderly cats new life as they’re suddenly zooming around like kittens. Dogs that had absolute meltdowns getting into the car or during thunderstorms are calm and relaxed. It’s frankly amazing. The university is doing studies right now with rats that are finding CBD can successfully treat anticipatory nausea in chemo patients.
I had never heard of anyone else who used CBD oil on their rabbit, but when Lahi was diagnosed with an ultra rare malignant cancer that had spreading throughout his body, I brought home a bottle and started using it. He was completely terminal, the cancer was spreading at an alarming rate, at that point the goal was simply to keep him as comfortable as possible for as long as possible. I believe it worked—I finally made the decision to euthanize when he began limping (“freedom to express naturally motivated behaviours” is one of the main tenants of animal welfare, so once his movement became hindered I made the decision to not let him decline further) but even in the vet’s office, waiting for him to arrive with the injection, Lahi was grooming and running around and showing no significant signs of pain. At that point, he’d had his toe amputated (from where the main tumour appeared), a tumour removed from his knee, there were tumours in his lungs, lymph nodes, mouth, shoulder, on his face, and surely many others we never found. And he wasn’t in pain.
To sum:
THC: toxic to animals
CBD: not toxic to animals
Marijuana should never be given to animals but if you have an animal in pain or suffering from stress and anxiety, CBD products that have had the THC removed can potentially do a lot of good.
Ah, but, if you do decide to try CBD oil for your rabbit, carefully look at the ingredients list. It’s often suspended in things that rabbits can’t have. Most of the CBD oil I’ve seen intended specifically for pets is suspended in fish oil to try and make it more palatable for cats and dogs. The fish oil is the only thing that makes it “for pets”, as long as it’s just CBD oil it can be used for pets and people. The bottle I used for Lahi had almond oil in it, which wasn’t ideal, but it’s the protein in almonds that is bad for them and oils don’t typically have the source protein. Plus he was very terminal, so I didn’t exactly need to worry about long term effects of a minimal amount of almond oil.