From my understanding of SIDS and risk of co-sleeping with a smoker 
it is that it changes the sleep patterns and type of sleep in the 
smoker.  Thus, they can have periods of very deep sleep where they 
may not be aroused as easily as a non-smoker. However, I do not have 
any information about how long this condition could last.

Also, there would be the smells of the smoke in the mother's hair and 
on her body when co-sleeping that could have a detrimental affect to 
the baby.  As Sarah Vaughan has already stated there is greater CO 
exhaled from a smoker.  Obviously this last part would be gone with a 
past smoker.  And the previous would probably de diminished by the 
time this mother's baby is born.

Regards,
Ruth Berkowitz
Ruth Berkowitz, IBCLC; BFHI Assessor & Educator;        Grad. Dip 
Counselling; ABA breastfeeding counsellor& trainer Melbourne AUSTRALIA

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