I hope I'll be forgiven (and redirected) but with the recent claims about formaldehyde in higher voltage e-cigs, I am a little nervous since I have always used my ego-c's at 4.8 volts. I believe I'm using a 2.5 ohm heating coil. I only vape unflavored juice. I do, once in a while, get a dry nasty hit but generally it's smooth with a nice throat hit. Should I be worried/continue to use the higher 4.8 voltage?