It's happened with every device from Evod, an ijust, to my iStick, he mostly tries with juice from new leaf with 2.4 nicotine, but he does the same with my lower strength juices, I think most of the juices are 50/50. I really want him to succeed so he stops smelling like an ashtray now that I'm off the stinkies. I will shop for some higher vg juices in flavors he likes (coffees and tobaccos) and see if that helps at all. He keeps trying for me, but I hate seeing him gag and cough. My best friend complains of the same problem. If I can find the solution I will be their hero!