The Government is being urged by its drugs experts to ban a potent legal high called Annihilation.
The Advisory Council on the Misuse of Drugs said it would recommend that the Home Secretary puts the product – marketed as a "herbal incense" – on the list of controlled substances.
Police in Scotland warned against Annihilation use last week, saying it had left at least nine people in hospital in the past three months.
Professor Les Iversen, chairman of the ACMD, said some users of Annihilation, a synthetic cannabis, become "severely agitated" and "over stimulated".
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