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For wildfire smoke, choose a purifier rated for at least 1.5 times your actual room square footage to account for the high concentration of particles during smoke events

People generally know that smoking is harmful but tend to underestimate just how much, said Dr Sarah Jackson, a principal research fellow at UCLs alcohol and tobacco research group

The WHO published prevalence trend estimates in tobacco smoking, as shown here, in their 2018 2nd edition report, which show slightly different smoking prevalence to the WHO country profiles

This differential pattern has the potential to exacerbate existing health disparities and we need to do better here