Most people i've known have experienced this at one time or another when not a hardcore smoker. Drinking and smoking will make em puke, but drinking then smoking is almost a guaranteed vomit. And yes, swallowing smoke can CERTAINLY make you puke, just the other week i was sat on the toilet having a cigarette being a blokey bloke, my stomach gurgled and drew in air, and as such smoke involuntarily, that wasn't pleasant, i have ontrol now to stop the vomiting but it could have certainly come to apss