Back when I gave up the analogs, it took 24mg of nic for the first month or so, then dropped to 18, now am at 9 and even though I haven't smoked since late 2013, it's hard for me to go lower. Of course each of us are different, so our systems adjusts accordingly.
Of course, I'd read later on that no analog will produce 24mg of nic on every draw (if any), it was likely the suggestion of the man who turned me onto vaping stating that 'it was what I needed' that made the 18mg not work. And still, 9mg is a lot, more than in (most) analogs, because e-juice is a more controlled delivery system with a decent setup.
The bottom line being, as some has suggested, is not high quantities of nic, rather what works for you. If that means a bit of chain vaping at low nic, that's fine. You'll consume more e-juice, yet you're more in control. On the other hand, if chain vaping 3mg isn't enough, may want to try 6mg for a spell. The worst that can happen is that at first you may get a 'nicotine high', but can compensate with less vaping, in turn will consume less e-juice. That is, unless you love to vape for the pure flavor, then I suggest to have two different strengths. One for when you want to indulge as much as desired, another for when you need a 'rescue' dosage or when it's inconvenient to chain vape. It's good to be prepared for either situation. the higher strength can be in a less powerful device, such as an eGo style. This will also lessen any negative impacts, such as nicotine highs, or other experiences that you may go through. To this day, I still carry one 12mg tank with me, on the go or not far away at home. It's a dessert flavor to me, not an everyday vape, so treat myself every now & then.
You have a fantastic support group here at ECF, and I congratulate you on taking the first step to shift away from analogs. Keep up the great work, not for me nor anyone else, rather for yourself. As a former 37 year smoker, wished that vaping was an option three decades prior. While I can't rewrite history, can continue to make it, one day at a time, through vaping, the key that freed me from analogs forever!
I believe you'll be just fine, and don't forget, there's many ECF members waiting to assist when in need.
Cat