I personally don't really think it's because of more nicotine - in fact I think the average vaper gets less nicotine than when they smoked.
-I disagree and I agree.
I smoked and average of 30 cigarettes per day. Awake for 18 hrs.
From what I've read, one average cigarette contains approx 10 mg of nicotine but only approx 1-2 mg absorbed. So that would mean I was carrying around 300 mg of nicotine/day. And absorbing about 45 mg (avg 1.5mg per cig) within 18 hrs. So that's about 2.5 mg per hour.
I tried to reduce smoking with vaping. It didn't work for me.
So I started the patch as 21 mg. Keeping it on 24/7.
Being uncertain of transdermal absorption I can only guess and divide 21mg/24hrs = 0.875 mg per hour.
The patch alone wasn't enough for me. I would get really strong cravings a few times a day. So I decided to vape and patch.
I vaped 1 36mg carto per day. If vaping delivers/absorbs 1:1 then 36mg in 18 hours is 2mg per hour. Though I sure there's a loss in delivery, so I'll guess at actually getting 1.5 mg per hour instead of 2. If you add that to the patch 1.5 + 0.875 = 2.375 mg per hour absorbed. Which is about the same nicotine intake as I was smoking.
Now, I didn't start vaping that much when I first started the patch at all. Then I only vaped a couple times a day, after meals and at night (and in which I still had to really fight cravings). During that week is when my dreams were very vivid. I think it was due to a lack of nicotine and my body over compensating in high dopamine levels.
But I also think the delivery of nicotine through vaping is different from that of smoking. And if you chain vape all night before you go to bed (and didn't chain smoke all night before) , excessively high nicotine levels will have the same effect.