I found 2 of these in my sons room, they look old. They look like something that would be used for smoking pot. Is it? Why would he have 2? I wanted to find out for sure what these are before I go getting ahead of myself because he is usually a good kid. I have never touched the stuff in my life so I don't know what it is, for all I know it could be used for tabaco. It has some burnt residue on the larger hole and it smells like smoke. Here are pics of one of them. Please help.