There's a huge difference between an ex-smoker going down to zero nicotine and an admitted non-smoker using an e-cig at zero nic. Those that want to ban e-cigs are looking for stuff like this which shows they're attracting non-smokers.
What is so wrong with attracting non smokers? The vapors taste great and the practice is relaxing. With 0 nicotine the hobby offers all the positive aspects of meditative smoking without many of the health risks. My non smoking wife started vaporizing 0 nic to curve her sweet tooth to great effect. She lost 15 pounds so far vaping 0 nic desert juices. Just as there is gum with and without nicotine there are ejuices with and without. I have no problem with non smokers vaping; in fact there are benefits.