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One cannabis-based oil has been licensed for NHS treatment for epilepsy, but this is based on just the plant's CBD compound - often found in products sold in health food shops.

Researchers at Great Ormond Street Hospital and University College London are planning trials that will examine the cannabis compounds CBD and THC.

“Many CBD and THC edibles are marketed as being alcohol replacements too,” Warrington said.

The research team, led by UTS Professor of Risk Management and Injury Prevention David Eager, investigated the various types of movement passengers encounter during bus rides on routes across the Sydney CBD.

They say the ban sweeps up innocuous products, such as drinks containing “microdoses” with just a few milligrams of THC, and items that contain mostly CBD, a non-intoxicating cousin of THC popular with pain sufferers and cancer patients.