The change in US cannabis laws has led to a growing market in food and drink laced with the drug, as Meg Carter reports.

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Picture the scene: it's been a long day, you're feeling a little wired and have some time to kill. You drop into Dutchie's, a popular chain café, and place your order: "I'll have a skinny Morroccan and a gluten-free hash brownie, please." And you sit down among the business suits and chill...