Smoking rates in England have fallen to the lowest on record, Public Health England (PHE) has said.
In 2015, 16.9% of adults described themselves as smokers, compared with 19.3% in 2012.
Experts say the decrease may be partly thanks to the availability of e-cigarettes.
More than a million people said they vaped as they tried to quit and 700,000 used a licensed nicotine replacement product such as patches or gum.
Out of the 2.5 million smokers who tried to kick the habit, a fifth were successful.