These results are in accordance with previous reports in which the cotinine concentration in the serum/plasma samples of passive smokers (i.e., exposed to SHS) was in the level of less than 10 ng/mL and about 2 to 6-fold larger than those with no SHS exposure 12
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The department said that the smoke and vapour emitted by the pipes and electronic cigarettes contain organic compounds and metals harmful to humans.
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