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Like TLomon mentioned the tobacco industry is part of a well known conspiracy of the past. The tobacco industry was behind a PR campaign that counteracted scientific evidence which linked cigarette smoking to lung cancer.
It may be that cannabis, too, will prove lethal and it is just a matter of time. In sum, just because there is not a large scale, longitudinal study proving marijuana smoke causes cancer, does not mean it can be ruled out. Marijuana smoke, like cigarette smoke, contains known carcinogens. There is considerable evidence that cigarette smoking is related to lung cancer and many other health hazards. It took decades to demonstrate this. The widespread use of marijuana for recreational uses is a relatively new phenomenon.