In particular, infants who died of SIDS were more likely to have been exposed to maternal cigarette smoke than the controls (25 SIDS and 5 controls); 19 of the 25 SIDS victims and one of the 5 control subjects with smoking mothers showed mild TH/DAT-scores (+) in the SNpc and PAGsm neurons. Here, SLC6A3 is linked to sudden infant death syndrome.