To understand the temporal relationship between smoking and SRO, the effects of the interaction of wave 1 smoking status (current vs never smoker and former vs never smoker) with history of SRO were examined. Table 4 shows AORs from separate multiple regression models on SRO and on current smoking in wave 2 for combined effects of smoking status and prior SRO reported in wave 1. Never smokers without a prior SRO at wave 1 comprised the reference group in each model. These analyses did not fundamentally change the finding that smoking predicts increased risk of SRO and that the reverse relationship does not hold but indicates nuanced impact of both SRO and smoking history.
