You notice this and it makes you feel jealous and bitter, no? I totally feel you on this... My best friend tells a story of once being at a party when "suddenly" all his friends stopped drinking. He asked them why and they said they were all out of mixers, so they stopped drinking, they could not make any more drinks. My friend was not just baffled but pissed off because he couldn't understand why, HOW, they could just be done drinking when there was still plenty of alcohol left. And I completely get that, because I am an alcoholic. I will never understand just having one drink or having any sort of a voluntary stopping point. And I HATE IT that other people can effortlessly handle something that just runs me...