Hey all I'm still pretty new to this - I'm happy wit my ego t except often when I inhale there is this annoying bubbling sound, I've dismantled it and there's no leaks, tried blowing thru the airhole - to no avail. It happened on my first cartomiser/clearomizer (not sure what it is its see thru with 2 wicks if that's relevant). Any suggestions? Are they just dodgy cartos or clearos?