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Amid a haze of smoke, from people taking hits of cannabis distillate from “rigs,” or high-tech bongs, sits a portable Tim Hortons coffee urn, offering shoppers a cannabis version of the classic Canadian beverage — a double double, or double cream and double sugar — infused with tetrahydrocannabinol, the chemical that causes a high.

Dextrose or glucose is one of the single sugars, while sucrose or cane sugar is an example of a double sugar.