Hmm- I expect this will be a bit controversial, so I'll say first off that this is just my opinion, and it might be bad advice for some, but... having gone from cigarettes to vaping a couple of times I'd actually advise people to consider starting vaping at a nicotine level that does make them light-headed and maybe even just a bit queasy, and cut down from there.
The reason I'd advise that is that smokers are naturally quite good at titrating their nicotine intake from cigarettes. Even if you're really craving a cigarette you'll tend to find it distasteful once you light it if you're just a bit OD'ed on nicotine already. Vape enough nic and, at least in my experience, you will pretty much just stop smoking of your own accord. YMMV, of course.
Just how much nicotine you need for that depends a lot on your setup. With decent equipment 1.8% is probably enough to get most people spinning, but that might be way too much for light smokers, and not quite enough for very heavy smokers. And I'm assuming an MTL tank at fairly low wattage- if you start with a setup that drinks juice 1.8% might be very high.
So, of course, use caution and common sense. The idea here is to go just a bit into too much nic territory. Go too far in that direction and you can make yourself ill. Absent some medical condition you're very unlikely to hurt yourself in any permanent way (unless you get so light-headed you walk into traffic) but you could have an unpleasant time.