What made me sick from drinking? This has never happened before?

Me and my two friends all shared a red white and blue Smirnoff bottle (the medium sized one 750 ML 30% alc) and we finished it in about 50 minutes we never had done it that quick we were drinking from the bottle. But I was fine for that, it was when we got too the cigarettes I had like 4 back to back to back and by the 4th one I just started to get really nauseous and not feel good. Then an hour or 2 later I started dry heaving and having diarrhea. So what could it have been? I hadn’t drank in around a month before this