i had a little of that 2 years ago when i started. it went away after a few days.
and, well, i vape (about 60mls a month) way too much, and last week i had some bluegreen boogers when i did my preface wash nose blow in the morning...kinda freaked, but it stopped too hehe.
i believe e-cig`s to be safer, not completly harmless, what is? with spare the air saying cut down on driving and yet no real change because of money from gas taxes car sales and not to mention goverment bailout to some automakers there is no margin for any loss of money coming in.