FactCheck: Does cannabis legalisation cause ‘exponential’ increases in the use of the drug?

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A leading member of a group of doctors warning against a liberalisation of Ireland’s approach to recreational cannabis use has claimed that countries and states that have legalised cannabis have experienced exponentially increasing rates of drug use.
He namechecked Portugal, Canada and referred to unnamed US states where the rate of cannabis use was “exponentially” increasing.  But is it true? Has legalisation of cannabis led to increased usage?

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