For workplace, program, and bulk screening needs, urine and saliva cotinine tests are commonly used because they are simple, practical, and easy to administer
[PMC free article] [PubMed] [Google Scholar] 158.Soder B Neutrophil elastase activity, levels of prostaglandin E2, and matrix metalloproteinase-8 in refractory periodontitis sites in smokers and non-smokers
And keep all the unused portions in the refrigerator to last a long time
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Some of the things that may lead a homeowner to consider more frequent cleaning include: smokers in the household, pets that shed high amounts of hair and dander, flooding or damage to the home or HVAC system residents with allergies or asthma who might benefit from a reduction in the amount of indoor air pollutants in the homes system