Yes, im dual sometimes and solely vaping at times. But i noticed I get really sleepy the days I only vape. I yawn constantly. I also think I don't take deep enough breaths when only vaping and maybe that's why yawn. Wish I could kick them permanently but im doing better than I was I'm down to a few packs a week. And in vaping everyday vs once every few months. It's taken some time to find the right everything.
GemInEye, I was having this exact same problem. I haven't had a cigarette since the first of June, though, just vaping. I was having some bad cravings, but didn't want to actually smoke again, so I was struggling. Found I was vaping almost constantly and still didn't seem to be satisfied. I thought all the yawning was because I was basically breathing vapor! LOL! I finally figured out it must be because the nic level in my juice was too low. I made up some higher nic stuff to mix with the lower nic juice, and it helped tremendously. Yesterday I was on the higher nic juice all day, and I did notice along about 7:00 pm or so that I had had a bit too much. Jittery and heart beating too hard... so I switched back to the lower nic juice for the rest of the evening and those symptoms passed in about an hour. However, I didn't have those urgent cravings, and I wasn't chain vaping all day, either. I'm still trying to find the perfect level for me, but I think if you try upping your nic level for vaping, it will help a lot with the jaw-cracking yawns and sleepy tired feeling.
And back to the CONTEST! Good luck to everyone, and thank you once again, Innokin, for giving us all this opportunity!

I hope I win one this time! LOL!
Does anyone have any idea WHEN the winners will be announced? The suspense is KILLING me!
~Lannie