I quit smoking 3 weeks ago thanks to vaping. In that time I've stopped waking up with a hacking cough, and have stopped coughing up sticky brownish-yellow phlegm in general. But I have noticed one negative change -- I produce a lot of clear, loose phlegm now that I'm vaping. Has this happened to other vapers? Does it eventually go away (meaning it's part of the quitting cigarettes process), or is it being caused by vaping?