I've been vaping for about three months now happily. I have a minagery of different setups, dripper, drip tanks, clearomizers and batteries. When I first started vaping I had really sore gums. I couldn't figure out why. Now I know, and if anyone else has this issue maybe this can be a little psa for you. At first people told me it's the nic, so I stepped down and was loving my 12 mg bombies seven seas in a Nautilus mini. I kind of tried ignoring the sore gums but man, it's annoying and painful. That's when I bought a dripper. I figured I'd be using 3mg nic so maybe my gums wouldn't hurt so badly. So I started Dripping epicus nebula the general. An amazing vanilla custard that I just keep buying, almost weekly, it's just that good to me. So with the dripper I haven't really used the clearomizer with the seven seas (7 different fruit flavors). Then for about a month my mouth was cured. Everything is perfect. So I immediately thought, oh! It's the pg! (epicus nebula is 100% vg if I remember correctly. That's what everyone at shops thought also. So I've stuck to very high vg liquids. Today I was feeling adventurous so I went to the shop to pick up some epiclouds juice. I love their doughnut pounder but wanted a fruit flavor because I've missed it. I picked up strawberry circus, which is like strawberry candy. About an hour after using it in my dripper bam, my gums were on fire again. It's the fruit flavors causing it now I know. Now this is just my experience with this, but personally I won't be buying any more fruit flavors. Something in the flavoring is irritating me. Went back to custards and creamy flavors and now I'm fine again. If any of you are having sore gums and you only vape fruity flavors. Try a cream! It might just be the cause!