Well, yes. I am having awful shortness of breath, trouble crossing the parking lot to work, worse than I ever did on cigarettes. I smoked less than ever when I finally quit and went with the ecigs. I hated what smoking was doing to me, the smell, the risk, and having smoked for 37 years, trying Chantix three times, I'm glad I found ecigs. However, I didn't smoke inside my home, and get very short breaks at work. So I have found that my vaping is increasing as time goes by, and I'm feeling worse too. In the very first few days and weeks, a cartomizer would last all day. Now that is not the case. I go through about 2 ml of juice on average a day and a cartomizer or two. It just depends. But I know that I vape more than I smoked, take my PCC into work with me and vape in the bathroom when I want to. I didn't smoke cigs in the bathroom! So for me, I think it's vaping too much in my opinion for my own good. I'm so excited to be not smoking cigarettes, and having found something that feels like a cigarette, tastes like a cigarette, and is relatively "safe", I just keep vaping more and more. I'm basically chain vaping all the time. So, therefore I think I need to vape less. Very simple. I'm not sure it's actually the PG or the VG that is causing it. Don't really know on that one. I'm Vegan, so I don't eat a lot of processed foods normally that would have PG or VG in them. I have a terrible itchy rash, and do wish I could identify the cause. Hoping it's PG cause I just bought a bunch of VG liquids! However, I take a med everyday and have for years that has PG in it. Go figure.