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The objective of this study was to assess the validity of two questions about the perception of intensity of exposure to secondhand smoke (SHS) at home using as a reference environmental markers (airborne nicotine and benzene) and biomarkers of exposure (cotinine in saliva and urine). This was a cross-sectional study in a convenience sample of 49 non-smoking volunteers. We found a high correlation between self-reported SHS exposure and airborne nicotine (r sp =0.806, p&lt;0.05), salivary cotinine (r sp =0.752, p&lt;0.05), and urinary cotinine (r sp =0.626, p&lt;0.05). We did not find differences between the score question and the conventional ones (p &gt;0.05). In conclusion, the significant correlation of the two questions proposed with environmental markers and personal markers indicates their potential validity to assess exposure to SHS at home.

Validity of self-reported intensity of exposure to second-hand smoke at home against environmental and personal markers