The rise in popularity of e-cigarettes in the UK may have resulted in more successful attempts to quit smoking, according to UK researchers.
The British Medical Journal work looked at trends in quit rates and support in England from 2006 to 2015.
E-cigarettes seem to have had no effect on the number of people trying to quit, but more have actually managed to stop.
The authors say vaping may have helped about 18,000 extra people in England successfully give up smoking in 2015.
The team, from University College London and Cancer Research UK, say theirs is an observational study, and therefore cannot prove direct cause and effect.
One smoking expert said it appeared e-cigarettes were a “major contributor” to the trend.