Assuming you're talking about colored glass and not a coating of opaque paint you should be fine. Certain companies that import their smoking accessories from China have lead paint decals that can be harmful to your health. If you're still concerned you could expose the tinted piece to high heat with a torch (a lighter may leave carbon residue) to see if it gives off any fumes that would indicate its not just the heat resistant material that the smoking piece is made out of.
I would be able to help you significantly better if I could see the piece.