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Tank emptied to 3/4 full

Smoke concentration can fluctuate heavily throughout the day, meaning many people won't be exposed to peak PM2.5 levels for a full 24 hours

Secondly, the region benefits from the presence of major e-cigarette companies that actively engage in market expansion through innovative product offerings and aggressive marketing strategies

The first data suggested a large decline in smoking between 2010 and 2013, but there were not enough data to investigate in children (the raw data suggested a small increase in daily smoking in under 18s, from 2.5 to 3.4%, although confidence intervals are not presented, and no significant change was found)