How long does cannabis stay in your system?

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While a high might only last a few hours, cannabis can linger in your body for days after you consume it, experts say. But exactly how cannabis works its way through your system is a complicated question. Here’s what we know. Smoking or vaping cannabis is a “very efficient way to get the drug into your bloodstream,” said Dr. Robert Mann, a senior scientist at the Centre for Addiction and Mental Health.

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