What is the proper way to dispose of old tubes?

Are tubes considered hazardous waste? Do they require special handling to dispose of properly? Or are they just regular trash that can be disposed of in the garbage?

Note: I am not looking for responses of the type, "I don't know/care, I just throw them in the garbage." I have a bunch of burned out old tubes that I want to get rid of, and I want to do so in compliance with applicable requirements.