Smokers

Can someone please tell me why people smoke in non-smoking rooms?

All our rooms have a balcony, if you need to smoke just walk out and close the sliding door. Not that hard. I spent $750.00 on a machine today that cleans out the smoke odor in rooms. I would have love to have spent that money on getting our treadmill fixed or adding a business center. However, I have recently had two groups that seem to really want to smoke in our none smoking rooms.

I really just don't understand people sometimes.