I'm smoking 36mg nic juice all day long every day. And I don't even feel a head change. No light headed feeling or anything. So should I pumb up to 60mg? Or what? I don't know at what point the "mg" turns poisnous. But all I know is a normal cig does the trick more than 4 hours straight of vaping 36mg.
Ack! Even the
idea of 60 mg is scary - It's generally intended for mixing, not straight vaping. I did some reading, but had a hard time figuring out what nicotine levels you ingest with e-smoking vs. normal cigs. Too many uncertainties at this time. This post has some relevant info, though:
Nicotine Safety Info. That is pretty general, but you can search here or Google "60 mg e-liquid" (which will also lead to many posts here).
I agree with SNM that expecting a "head change," lightheadedness, etc. is not typical for a long-term smoker unless you've been without a smoke for a very long time. I'm puzzled, because, personally, if I have a smoke after a long time without one & feel a reaction... I don't find it pleasant.
I'm pretty new to this, but your post worries me, so I'll try to help with some general thoughts... None of the following is stated as fact, just ideas based on my scientific background, my own & others' experience, & the fact that my body tends to be very sensitive.
What type of cigarettes do you smoke & how much? Unless you're smoking like 5 packs of unfiltered a day, I don't think the problem is that you're not getting an equivalent amount of nicotine from the e-cig.
It could be something as simple as taste addiction. I haven't tried much tobacco-flavored juice, but I'm sure none taste
just like a cig because they're a liquid concentrate, not burning plant+other stuff. For some people that can be a huge factor.
Keep in mind that cigarettes have a ton of stuff in them besides nicotine that your body is also used to. I don't think anyone has studied the addictiveness of
all the stuff in a regular cig, but when your body is used to something - even if it's not officially "addictive" or mood-altering- it does take time to adjust. Going cold-turkey off of some medications can make you feel nasty, even though they aren't "addictive." Also, all those chemicals interact with each other, your body, other drugs, etc. So there could be a
combination that e-cigs aren't providing. (I did see a blurb about ammonia in cigs making your body absorb nicotine faster. Since you aren't getting that in an e-cig, maybe you're getting nicotine more gradually & it feels odd to you.)
A big factor with nicotine addiction (and possibly the "head change" you mentioned) is that it causes your brain to release extra endorphins, which make you feel relaxed yet also alert. (I know that makes no sense, but there it is). That's why smokers tend to need a cig to calm down when stressed, but also to give a boost when they are tired. *shrug*
Some people are more sensitive to that than others. Perhaps your body doesn't make as many endorphins on its own as you have gotten used to with cigs. And maybe e-cigs, for some reason, don't provide the same level of endorphin production. *shrug* No one really knows at this point.
That's just one example of something you may be getting from cigs, but not e-cigs. For all I know, it could be your body has a bizarre craving for... I dunno... 4(2-Butenylidene)-3,5,5-Trimethyl-2-Cyclohexen-1-One.)
Do you have any health conditions or take medications? (You don't have to tell us.

) If so, there could be an interaction between them & something found in cigs but not in e-cigs.
And finally... This will sound silly- please don't take it wrong! I don't know how long you've been vaping or what PV you use... But are you doing it right? Heh. I ask because I didn't know for a while that you inhale differently on a PV (at least on an automatic). It made a big difference when I learned that. Since you've been here a while, I'm sure you know that, but just had to mention it.
Good luck & please be careful! - RR
Sorry this is so long, just so many possible factors.