Realistically, how much nicotine do we actually absorb from gum or lozenges?

I quit smoking about 2 months ago and then I switched to vaping for a few months before finally quitting that too. I’ve been using nicotine gum/lozenges to manage cravings, but I don’t feel like I’m getting anywhere near the nicotine I used to from smoking and vaping.

From what I understand, a cigarette has about 8–10mg of nicotine, and you actually absorb 1–2mg per cigarette. A single 4mg piece of gum or lozenge is supposed to deliver a decent hit, but I can chew 3–4 pieces over a few hours and barely feel the stimulant effect I used to get from my previous vape.

Am I missing something about how nicotine is absorbed in the mouth versus lungs?