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Retrieved 12 September 2018

A HEPA filter is rated to remove at least 99.97% of dust, pollen, mold, bacteria, and any airborne particles with a size of 0.3 microns (m). Since these air purifiers efficiently filter out even the smallest particlessuch as fine particulate matterZhao says they can be very helpful in clearing smoke from the air

Results were consistent with our hypothesis that affect towards cigarettes predicts smoking status and that this association is partially mediated by risk perceptions: more positive affect towards cigarettes was associated with lower perceived risks of smoking cigarettes, which in turn was associated with higher odds of being a current smoker

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However, due to the difference in the aroma of the smoke produced by burning and non-burning tobacco, there is still a large gap in its sensory quality compared with traditional cigarettes