t says just over half of current or ex-smokers have now tried electronic cigarettes, compared with 8% in 2010.
Action on Smoking and Health (Ash) surveyed more than 12,000 adult smokers.
A separate study found that most e-cigarette users were using them to reduce smoking.
Use of e-cigarettes among people who have never smoked remains small at 1%, Ash said.
Ash has commissioned a series of surveys on electronic cigarette use since 2010, with the latest survey conducted in March.
Continue reading the main story
Smokers are increasingly turning to these devices to help them cut down or quit smoking”
Deborah Arnott Action on Smoking and Health (Ash)
Of those now estimated to be using electronic cigarettes, around 700,000 are thought to be ex-smokers and 1.3 million to be using them alongside normal cigarettes or tobacco.