No such thing, really. It is possible to get too much nic, and some people get allergies from too much PG, or "heavy lung" from too much VG, but the solution to that is to adjust the juice content, not necessarily the amount of vaping.
I used to (as in, up to a few weeks ago) make sure I carried no less than 3 mods on my person at all times and had more available just so I wouldn't smoke.
Chain vaped every waking moment when I wasn't in a serious no smoking zone, such as a bank or city hall or something.
But I was seriously detoxing from cigarettes, which I definitely smoked too many.
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