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I wondered because I saw lots of air purifier tests on pollen, but pollen is generally 10 microns or larger, whereas I was really concerned Read more The term HEPA filter can be confusing

For continuous variables, the median was selected as the measure of central tendency given its robustness in the presence of outliers

Each cigarette contains 10 mg of tar and 1 mg of nicotine

Discussion of the risks and rewards is most useful if the patient does not express a desire to be a nontobacco user, whereas a focus on the roadblocks addresses patients who want to stop using tobacco products, but express a lack of confidence in their ability to quit