Pugmire, Sherrill, Venker, Martinez, Guerra (2012)

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Respiratory Health Effects Of Childhood Exposure To Environmental Tobacco Smoke In Children Followed To Adulthood(abstract only) is a study that purports to blame SHS for a range of long-term childhood respiratory symptoms: asthma, wheezing (yes, really,) coughing and chronic coughing.

Despite the fact that such illnesses and symptoms increased, while prevalence of smokers decreased in the same (15 year) period, the researchers still managed to find a positive correlation between smoking and the illnesses and symptoms:

Conclusions: Exposure to parental smoking increases the risk of persistence of respiratory symptoms from childhood into adulthood independent of personal smoking.

Numbers quoted in the abstract follow the form of:

ETS exposure in childhood was significantly associated with persistent wheeze (RR adj 1.9, p->0.026)

Which suggest that if you didn't have any SHS exposure as a child, ever, you were unlikely likely to have a persistent wheeze as an adult, where as if you had a single whiff of parental SHS you were 1.9 times as likely to have a persistent wheeze in adulthood. (2 times a small number still tends to be a small number, regardless of whether you consider 2-times a small thing 'significant.')

If both your parents were 60-a-day smokers however, and never opened the windows forcing you to breathe in all that SHS, you were.... still 1.9 times as likely to have a persistent wheeze in adulthood.

Yes, really:

. ETS exposure status was assessed as “ever” or “never” based on either parent reporting current smoking between the child’s birth and 15 years.

Authors

References