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E-cigarettes can weaken users body's ability to fight off the flu virus,  research claims.

The study, carried out by researchers at the University of North Carolina, saw 47 volunteers take part with startling results.

Smokers, vapers and non-smokers took part, with each group given the same weakened version of the flu.

As expected the immune systems of the smokers were worse at seeing off the disease, with results showing that the virus was able to replicate itself.