That deserves a big fat, "EWWWWWW!".
It depends. EWWWWW if it’s Skoal or Happy Days or any other minty crap.
But Copenhagen satisfies…
Actually that stuff must be a pretty efficient nicotine/whatever delivery mechanism. I quit smoking once. I quit drinking once. I probably quit the Cope two dozen times over two decades before it finally “took.” (And did that because the crap popped up to $7.00/can - and I'm too cheap to pay it - at one point.)