Maternal second-hand smoke exposure during pregnancy also significantly increases the asthma risk in preschool children
It is well documented that asthma incidence is increased by MSP [34, 35]. Birth cohort studies have found asthma incidence to be higher in mothers who smoked during pregnancy (adjusted HR 1.79 (95% CI 1.20–2.67) [36]. A recent meta-analysis reported MSP to significantly increase asthma risk in children of all age groups [2]. The authors found pooled odds ratios of 14 studies showed an increase in wheeze in children aged 2 years and younger (OR 1.41 (95% CI 1.19–1.67)), an increase in asthma risk in children aged 2 years and younger (OR 1.85 (95% CI 1.35–2.53)) and the risk of asthma in children aged 5–18 years was significantly increased