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Grey applauds the latest approach: "The ATU's work is a key part of our strategy to tackle smoking, as it's trying to stop young people from starting and helping adults to quit." But she is more pragmatic than fellow Liverpudlian Andy Burnham, the health secretary, who last week said he wants to see smoking down to 10% of the population by 2020

Risk of bias Risk of bias was performed for each included study using the risk of bias assessment tool that includes ten different items [46]

We recommend that cigarette smoking status is expanded to routinely include ENDS status

doi:10.1038/nature02849 [2] Bhattacharya, S

Nicotine tolerance varies greatly from person to person

Charging time