Women who vape during pregnancy will be more likely have a preterm birth and that their infants will have a lower birth weight (LBW), lower neuro-behavioural scores and increased respiratory symptoms when compared with non-smokers.

Women who vape during pregnancy will be less likely to have a preterm birth and their infants will have a higher birth weight, higher neuro-behavioural scores, and fewer respiratory symptoms than when compared with tobacco smokers.