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I was doing a holiday gig the other night at a friend's restaurant in Nashville, Indiana. He throws one every year for his closest friends and business acquaintances, and he hired me to provide some nice guitar music for the evening. I had gotten him using an ecig months ago, and he allows ecig use in his establishment. So I had finished my set, and sat down at my table with a few other folks. I pulled out my ecig and was puffing away, and as usual some folks who had never heard of an ecig asked questions, which I answered. One lady asked, "is there nicotine in the vapor". I said, "no it's only water vapor". Well, she began to get a bit agitated, saying that she has a hypersensitivity to nicotine, that even trace amounts could give her palpitations or something. "If there's any nicotine at all in the vapor, I can't be around it. How can there be nicotine in the juice and not have trace amounts in the vapor?" Well, I immediately saw what I was dealing with, and putting the ecig in my pocket, told her no problem. My opinions about her hypersensitivity aside, I'm wondering if there is any science regarding the exhaled vapor and whether or nor ALL the nic is absorbed by the user. Anyone?