I agree, always play it safe. When I grew skunk I'm sure you could smell it for a mile away if I didn't have a charcoal filter. On the other side the afghan kush I am growing now barely smells at all. Best to have it just in case, you can always unhook it if you don't need it.I turned off my carbon filter/extractor for one day. I live 4 floors up. I hadn't gotten halfway up the stairs before i was overwhelmed by the smell, needless to say i sprinted the last half in record time.
If you are not legal, it ALWAYS pays to play it cautious.