Sleep.

[Souterain]

I have the opposite problem. When I smoked my sleep patterns were fractured and irregular. Since quitting the stinkies and taking up vaping I can now sleep for Britain!
I don't know if it's the chemical changes going on, but my dreaming has also become a lot more vivid, and very surreal. Not nightmare scaries, but incredibly realistic. Sometimes it's like a TV series, I continue where it left off on the next sleep cycle.

 

[Johnnyboy]

"To put it simply, you have to vape 24mg nicotine on a 9 watt device for over half an hour to get the same amount of nicotine you would get from smoking a tobacco cig in 5 minutes."

Wow! Really!?

"Basically its your body telling you something is different, that difference is 4000 less chemicals and not the same amount of nicotine."

Even after three months?

I agree with difficulty sleeping being a side effect of stopping smokng but after 3 months I reckon it's more likely to be too much nicotine. I vape way more than I used to smoke as it's much more enjoyable, less harmful and I no longer need to go out the back door.....that's why I had to reduce the nic.

Now if I can't sleep it's usually down to thinking about what new vape related toys I'm going to buy next :-)

 

[vaporsizer]

"To put it simply, you have to vape 24mg nicotine on a 9 watt device for over half an hour to get the same amount of nicotine you would get from smoking a tobacco cig in 5 minutes."

Wow! Really!?

"Basically its your body telling you something is different, that difference is 4000 less chemicals and not the same amount of nicotine."

Even after three months?

It could be, even after 3 months. Nobody is saying it actually is but it's possible & everyone is a bit different. I think you're idea of cutting down from the 18mg to 12mg might well help. When i started vaping i went straight in for 18mg but i found it too much after a short time. I had been a roll up smoker of possibly 20 a day.
Anyway, i went down to 12mg vaping & i have stayed there for the past 2 months. Vaping does keep me a bit wired but at this strength it's not affecting my sleep in a negative way.
On thing i will add is that when i cut from 18mg to 12mg, for about a week or maybe 2 i couldn't get enough out of it & i vaped more but then my tolerance shifted & all was well again.
You need to read your own body & take a step back & decide for yourself what your issue is & then just tackle it head on & it doesn't have to be a problem.

 

[KulrMeStoopid]

"To put it simply, you have to vape 24mg nicotine on a 9 watt device for over half an hour to get the same amount of nicotine you would get from smoking a tobacco cig in 5 minutes."

Wow! Really!?

"Basically its your body telling you something is different, that difference is 4000 less chemicals and not the same amount of nicotine."

Even after three months?

Yes really, Konstantinos Farsalinos, who' pretty much the leading doctor/scientist on ecig studies recently tested this. Our blood plasma from vaping, does not reach that of a single smoked cigarette level, for at least 35 minutes of consistent vaping on 24mg nicotine

yes even after 3 months

People still complain about quit smoking issues for up to 6 months sometimes even longer. You have to keep in mind, we may be replacing smoking with just nicotine, but we are eliminating a X years long dependence on 4,000+ chemicals that our bodies adjusted to having in it's system.

You're not even fully healed internally from smoking for nearly a year after you actually quit smoking. All of this, while it may not be obvious in your day to day routine, and even though it is improvements, our bodies must adjust to changes. A small change can have a BIG impact on your body as well as your sub conscious.

[h=4]2 weeks to 3 months[/h]	Your heart attack risk has started to drop. Your lung function is beginning to improve.
[h=4]3 weeks to 3 months[/h]	Your circulation has substantially improved. Walking has become easier. Your chronic cough, if any, has likely disappeared. If not, get seen by a doctor, and sooner if at all concerned, as a chronic cough can be a sign of lung cancer.
[h=4]8 weeks[/h]	Insulin resistance in smokers has normalized despite average weight gain of 2.7 kg (2010 SGR, page 384).
[h=4]1 to 9 months[/h]	Any smoking related sinus congestion, fatigue or shortness of breath has decreased. Cilia have regrown in your lungs, thereby increasing their ability to handle mucus, keep your lungs clean and reduce infections. Your body's overall energy has increased.
[h=4]1 year[/h]	Your excess risk of coronary heart disease, heart attack and stroke has dropped to less than half that of a smoker.