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Vapers who have Covid-19 are up to 20 per cent more likely to transmit the virus, spreading it in clouds of smoke, a study has found.

Bystanders exposed to low intensity expirations from an infectious vaper in indoor spaces, such as houses and restaurants, are one per cent more likely to catch coronavirus, researchers from Italy, Mexico and New Zealand found. However, if the person is using their e-cigarette intensely and breathing out a lot of smoke, this risk increases to between five and 17 per cent, they conclude.