You can consume cannabis in a wide variety of manners that are not smoking it.

The most popular alternative is putting it into a vaporizer, but eh, still bad for the lungs. But you can also make tea out of it, you can make edibles (most popular: cannabutter and brownies), you can make extractions like hash, you can make tinctures for your skin, and there's even suppositories for rectal and vaginal use.