IF you are quitting smoking, that may not be so abnormal you are detoxing from a bunch of other stuff and etc., if you are transitioning.
If you are new to nicotine completely, well that might be a bit much but it's totally not uncommon to like chain vape a bit at first and etc.
Just keep an eye out for nicotine overload symptoms, such as yawning fatigue, headaches, nausea, etc. Hiccups (some folks) if you start feeling really disconnected and weird, well take a break.
There is also the option to chain vape it up with lower strength nicotine, and I'm not really sure that there is "some upper limit" to nic well, there probably is, but if vaping it, I'd think a person would like, pass out before death or get really woozy and NOT have the desire to vape and etc. and whatnot.
I mean, sure slow down and calm down if that's your aim, but also like, um, if you aren't getting nic sick you are probably fine, although you MAY want to establish a tank with lower level nicotine if and when you will be in situations where you are just going to feel like you MUST chain vape and keep the higher nic stuff for when you just need more nic per puff, faster and etc.
Anna