Hmm... well obviously there's not enough info in the original post for any real deduction as to the real cause. I agree with jonny. Other considerations are the hairs in your lungs are finally coming back to life and purging the crap they've been laden with from years of smoking? Natural aging making you more susceptible to the natural drying process of vaping? Have you tried getting a home humidifier to add some moisture into the air you breathe around the home? Are you drinking 10 oz glasses of water or clear liquids a day? Did you mention to the doctors that you vape? Often if you give them something to blame, they're less likely to look for other possibilities which could be the cause. I can't imagine every coughing from using my eGo-T. The vapor is so light, and so cool, and so not intense... I'm pretty sure I could use it 24/7 and never cough. I have a liquid (same mg and PG/VG blend as the others I use without problem), that gives me some coughing issues to the point where I "see stars" and get a little light-headed. Its a cola flavor (obviously I'll be throwing it away). Did you try many different juices? Did you even cough using a straight non-tobacco menthol?
I ask these exhaustive questions because it is unfathomable to me that someone can be a super-member and year+ vaper, and have posted near 400 times... but return to cigarettes. Even after 7 weeks I know I'll never return to cigarettes. If vaping ever becomes a problem, I'll either try every device/juice/trick to continue, or I'll quit vaping but NOT return to cigarettes. Very very strange. If you ever find resolution or cause, please update us. Good luck.
