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tweet by Johann Hari: The core of addiction is not wanting to be present in life, because pour life is too painful a place to be. This is why imposing more pain or punishment on a person with an addiction problem actually makes their addiction worse.
You're right about that but weed is a carcinogen too, & as far as I know LSD and most psychedelics are non toxic and don't cause cancer so there's a bigger argument to be made about them being legalized.
That link says cannabis smoke is a carcinogen, not cannabis itself. You don't have to smoke cannabis to consume it, and almost anything set on fire and inhaled will cause cancer, including campfire smoke. Should camping be a 26 and up activity?
I wouldn't count the Known to the State of California warnings for much. They added that warning to coffee cups despite the link being weak and contrived.
And as others said, no study has linked consumption of weed edibles (or weed vaping) to causing cancer. In fact, it's the opposite. Several (preliminary) studies show that marijuana retards of reduces the risk of some cancers. It is often prescribed to cancer patients for appetite-gain and pain reduction (with fewer side-effects than other prescriptions for the same), but is also now being prescribed for its potential anti-carcinogenic properties.