http://www.cancerresearchuk.org/about-cancer/cancers-in-general/cancer-questions/does-smoking-cannabis-cause-cancer
there is a lot of researches about cancer the majority of them tell you that tobacco and cannabis are main reasons of cancer you can check on google also my grandfather used to smoke it but he died of cancer
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You need to read your own source. It does not say Cannabis causes cancer. Like I said if you had actual evidence of this claim it would be a world's first. Also you don't need to smoke cannabis to reap it's benefits.