Under one scenario, people would be able to apply for a licence to buy cannabis products once they reach the age of 21, provided they have the approval of a doctor, he said.
The drug would be regulated by a body that ensures the quality and safety of the products before they go on sale.
A rethink of the laws surrounding cannabis and related products was necessary to take cannabis out of the hands of criminals, said Roger Pertwee, professor of neuropharmacology at Aberdeen University.
In the 1970s, Pertwee co-discovered THC, the active ingredient in cannabis.
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