Some ferrets do snore when they sleep. If your ferret snores it may be worth mentioning it to your vet to check there is nothing dangerous causing your ferret to snore.
Marijuana can not cause ferrets to go into a coma and die
Ferrets can easily navigate stairs
ferrets go great with cats
No! Motrin, iburprofen, acetaminophen, and naproxen are all FATAL to ferrets. If you are concerned, call up a vet and ask them what you could give your ferret before taking him in. However, if your ferret has a fever, you should probably get him to a vet. Ferrets can catch the flu types A and B, which can kill them. Make sure your ferret is hydrated and eating well. Look up recipes for "duck soup for ferrets." Watch his poops and make sure they are normal. If not, get him to a vet.
Yes, Ferrets need canine distemper shots, only one vaccine is approved for ferrets. Canine distemper is fatal in ferrets (they die a horrible death) and is an airborne disease, being easily transmitted or brought in on your shoes or clothing.
If the ferrets head will fit into the hole, then the rest of their body can go through the hole
No
Only in movies and cartoons
Ferrets cannot digest peanut butter, it will either go straight through out the other end, or it may cause a blockage in the ferrets stomach requiring surgery.
Go To The Vet! Go To The Vet!
Male ferrets (and mammals) don't really ever go into heat seeing as they don't have a uterus and can't go through their menses. However, male ferrets will become more aggressive when around a female in heat. Especially when that female is another ferret.