I don't smoke but i'm curious about weed smoking because people argue about it when i tell them any kind of smoke is bad! is weed bad?

Bad and maybe good: Unfortunately most info on 'weed' is generated by government funded research. If the researchers find positive aspects they say they won't report them due to the threat of not being funded the next time. Until weed is legal we won't know the real story. Many cultures claim it as a sacred healing herb. The us pharmacopeia, pre-1950's, included it as a treatment for a variety of illnesses.

Cannibis: Smoking which involves inhaling anything potentially can cause acute or chronic pulmonary reactions Not clear yet whether this can cause COPD. Nutritional forms circumvent this and safest of all is CBD