No need, just wash your hands after if your worried about it. When I was a kid I used to carry my pellets in my mouth. It didn't do nothing to me, it didn't do nothing to me, it didn't do nothing to me, lmao.
Cancer is not likely, I own 2 pellet guns, and to the extent of my knowledge, as long as they aren't around your mouth all the time, around cuts,that kind of thing. When you hunt with them, the cooking of the meat takes away your risk.