Not at all, Poppy only smells occasionally but that's because of her diet, she needs help cleaning her bum, after that it's fine
What exactly is it that smells? The rabbit? Their poo? Their wee?
If one smells there could be probably a problem and you may need a vet.
I don't think they do, Boris lives in my room, and I've had all mine inside at some point. Boris himself smells lovely I think :lol: His hay smells lovely too, and I can't smell his poo/wee unless I don't change his litter tray for like 3 days and even then only smells a little bit when I'm very close to it.