They always say no smoking on planes, but nothing about snuffing on a space craft. What would happen if you " snuffed " in zero gravity? https://www.urgencynetwork.com/campaigns/2094/ticket-to-rise

Well, would it then ‘fall out’ of your nose or drift even further up, or what…

A pinch of snuff has its own gravity. It is well known that taking larger pinches is easier and I stand by the hypothesis that is this fact that makes it so. Your problem in space will be the speed and direction at which stray snuff particles might inadvertently obtain.