dipping in class?

So I'm not quite sure, but it's probably not a good idea to dip in class. Besides the fact that a big wad of tobacco in your mouth is gross (and rots your teeth) the dip cup sitting on the desk is not the most lovely site in the world. Glancing down the row of computers and seeing a water bottle with not water in it but a brown substance isn't how I want to start my day. Is it even legal?