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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.
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?