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CADR for smoke is rated at approximately 246 m/h, giving 45 air changes per hour in a 50m room at ceiling height consistent with the standard recommendation of 4+ ACH for smoke removal

The NRT may be associated with withdrawal symptoms with the most common adverse events like headache, skin rash, throat pain mouth, etc., However, in a study conducted on smoking cessation, nicotine gum and transdermal nicotine showed relieving withdrawal symptoms and 2-fold success rates compared to placebo

Because it would be unethical to purposely expose populations of humans to varying degrees of toxic air, much of this evidence relies on associations between air quality and human diseases

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PubMed Central, doi:10.1159/000439307