Actually you can under certain circumstances. It's addressed in a old natca mou from the 90's.Not unless you have a designated negotiated smoking room in your facility. And if you do it's only allowed there, not on position. Not that that stops people at my facility.
But you aren't allowed to smoke on position, are you?
Under normal circumstances no, but what does SMOKING (shit that we all breathe in / second hand SMOKE) have to do with SMOKELESS tobacco?
If you have asshats that are being lazy police yourselves up, say something. Don't be a douchebag that just bitches online. Hell you should encourage their habits. If you dislike them so much they might kick the bucket earlier than expected because of their habits.