Firstly, the sample of smokers was judiciously selected based on the geographical representation, but not a random sample of the entire smoking population in Shanghai, and the 1104 smokers in this study was a relatively smaller sample in comparison with the large number of tobacco smokers in Shanghai, which limited the generalization of findings in this study
N-Nitrosamines are organic compounds recognized as carcinogenic, theyre formed during tobacco processing and during the burning of a cigarette
For added benefit, infuse the humidifier water with your favorite essential oils
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Filter size and carbon amount Larger filters or those with more carbon may last longer, because they have more adsorption surface