Yes I have been to the doctor and have had many blood tests do to all the crazy symptoms I have had since I started vaping in January 2013. Most recently the hand specialist for an exray, which looks normal. I was currently smoking 70/30 vg/pg. I am a diy'er and have tried all mixes. This last one is what I settled on after achy calf muscles. I am on day one of quitting vaping to see if the joint pain stops. I hate going down this road. I love vaping. I found an old closed thread on here about joint pain. Also found this on the net. Backache? | e-Cigarettes - Electronic Cigarettes Anyone else going down the joint pain road?