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This is down from 15.1% two years before its introduction

"We got advice sort of 12 to 18 months ago that that steady reduction that we'd seen over the course of 30 years had started to stagnate, and that was in part a product of the lack of any real change in tobacco control," Mr Butler told 7.30

Their growth is regulated by various factors such as temperature and nutrient availability, but also by parasitism and grazing pressure

Hookahs are smoked over a period of time, typically as a social activity

Half of health care workers and doctors smoke, including the former health minister Gao Qiang, who used to smoke at meetings