How many plants start to cause a real odor problem? I realize it depends on the type (I'm thinking of going Northern Lights for a first try because I've read it's not as funky). Any idea?

Sorry to butt in on you guys. Just trying to do my research before I start, and I'm concerned that if I get 2 or 3 good plants going, the smell (which I love, but I'm sure my neighbors won't) is going to start getting out of control? And out of my price range?

Thanks!
O