I have some contractors in my house remodeling a bathroom. The main guy was asking me about my vape, how it was working for me, how long I'd been switched, etc... He told me he tried one and it gave him terrible heartburn. I asked him where he got his juice and if he'd tried various liquids. He said he got his stuff at one of the vape shops, and he's tried lots of flavors (sounded like mostly tobacco flavors). I didn't really know what advice to give after that. I told him I had a little heartburn when I first started, but it went away pretty quickly, but other than that had no clue what to suggest.