* Concern that UN agency sees e-cigarettes as "threat"
* Classification as tobacco products would curb use
* Scientists say e-cigarettes "part of solution" to smoking
* Critics say safety uncertain, risk of fuelling addiction
A group of 53 leading scientists has warned the World Health Organisation not to classify e-cigarettes as tobacco products, arguing that doing so would jeopardise a major opportunity to slash disease and deaths caused by smoking.
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