No doubt cannabis has medicinal effects but as an asthmatic who smoked a lot of joints for five years and now exclusively vapes I can tell you that I, personally, don't think its worth smoking it if you don't smoke cigarettes. If I couldn't vape I would stop getting high, that sounds quite snobbyish to the ex-toker in me but I wouldn't. I can't stand smoke any more, it heavily irritates my throat and seriously effects my ability to maintain my physical health. I have a better high off the improved level of fitness I have from quitting smoking then I ever got hitting bongs and smoking joints.
Obviously not every toker has even heard of vaping, or takes the risk of spending cash on a quality vape when they know a pipe is bound to work. I do know people who smoke a small amount for conditions such as MS, and I think its probably worth the negative for the positive but I still think they should vape. As someone who started smoking young (even though I didn't smoke for all that long) I still regret impairing myself so much physically at such a young age.