To be more accurate, infants with mothers that smoke are at a higher RISK of SIDS. We still do not know what causes SIDS. There are certain things that they've been able to identify as increasing the risk - stomach sleeping, low birth weight or premature birth, cold weather, younger mothers, overheating, etc. etc. etc. Most likely, no one factor alone is enough to cause SIDS. It is most likely a combination of things, including a predisposition for it.
And actually, most of the studies point to in utero exposure to cigarettes as a higher risk factor than any secondhand smoke after birth.
Thank you for elaborating on that! My knowledge of infants is quite limited obviously. I just remember while smoking to make sure I washed my hands and sometimes even brushed my teeth before visiting the little guys. They were pretty small twins born in the depths of a Canadian winter, but the mother was/is a non-smoker thankfully and they're doing great at only 2 months old so far!
"Risk" is indeed the word I meant to use. Many variable factors, of course, could increase that risk.
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