More water is good of course and might just solve symptoms for some people. However, I ended up going to the doc shortly after taking up vaping because suddenly, after all those years of smoking packs a day, I was developing nasty asthma attacks like I hadn't had since childhood. Of course I was scared to hear that vaping was the reason, but the docs explanation surprised me. He said a few things.
1. after not smoking for a bit the "blood hairs" in the lungs return, allowing your lungs to react to whatever environmental triggers they encounter. My lungs, in essence, were paralyzed all those years from smoking, essentially hiding my asthma though my adulthood. go figure huh. Umm, the way this plays out is a dangerous concept though, quitting smoking brings on asthma? lol bad bad image there huh. And not true, I had it all along but my lungs weren't able to get all dramatic on me so I pretty much forgot.
2. vaping means breathing in essentially lots of steam that loosens up crud in your lungs and needs to be expelled. I personally mostly just notice throat clearing.
The asthma attacks have now calmed down, a big faceful of dusty hay can still bring one on but they aren't just randomly happening to me like they were(was scary!), so it seems to my uneducated opinion that when the lungs do a bit of recuperation they act a bit jumpy for a bit before calming down some. So hopefully plenty of liquids will get you through the healing stage.
My humble .02
1. after not smoking for a bit the "blood hairs" in the lungs return, allowing your lungs to react to whatever environmental triggers they encounter. My lungs, in essence, were paralyzed all those years from smoking, essentially hiding my asthma though my adulthood. go figure huh. Umm, the way this plays out is a dangerous concept though, quitting smoking brings on asthma? lol bad bad image there huh. And not true, I had it all along but my lungs weren't able to get all dramatic on me so I pretty much forgot.
2. vaping means breathing in essentially lots of steam that loosens up crud in your lungs and needs to be expelled. I personally mostly just notice throat clearing.
The asthma attacks have now calmed down, a big faceful of dusty hay can still bring one on but they aren't just randomly happening to me like they were(was scary!), so it seems to my uneducated opinion that when the lungs do a bit of recuperation they act a bit jumpy for a bit before calming down some. So hopefully plenty of liquids will get you through the healing stage.
My humble .02
and I too have noticed some discomfort when I first wake up, but I have also suffered from respiratory/sinus problems for most of my life, living in this polluted environment, smoking or not. Some of it is caused by allergies to pollen or dust, or sensitivity to the poor air quality, I tend to get better when I travel away from this area. Since I have been vaping, I get occasional discomfort (probably dehydration) if I chain vape all day, but I notice that the air quality and humidity levels have a lot to do with how I feel from day to day (thick lung feeling when it's more humid outside etc..). I still feel better than I did just a few weeks ago, before I found e cigs. The morning hacking has almost completely gone away, and I am noticing improvement in my sense of taste/smell too. I will be moving to a cleaner environment (OR) in 2 months and I hope that this helps ease some of the breathing problems I face right now, that I had way before I ever took up vaping. I still feel better from vaping than I did from smoking, and I think it also takes time to let your body adjust and heal from all the damage from years of smoking. My sinuses are still acting up, stuffy a lot of the time, but I don't feel nearly as bad as I did when I just smoked. I also found the vapor to be much more pleasant when I breathe it in/out than smoke ever was. I am starting to think that I am going through a sensitivity stage, now that I have stopped burning up my lungs on a regular basis, and I am just becoming more aware of how I feel than I did before. I will definitely drink more water, as I don't think I have been drinking enough lately anyway, and try not to chain vape so much. I also vape 100% VG after having bad reactions to the PG. If you are looking for a good source of PG-free juice, alienvisionsejuice.com is a great source, they have really tasty flavors... Everyone is different, and I am sure there are many factors involved in what makes us feel bad. I still think it's much better to vape than to smoke, so I won't be giving it up any time soon. Now that I have gotten over the newness and learning curve of vaping, I expect I will get a better handle on how go about it, it's easy to get carried away in the beginning, with all the different flavors, and devices to try out. 
