It's a harm reduction. I've personally not smoked for two weeks now, I've tried quitting a bunch of times with nicotine gum and found it absolutely useless - but I found this stuff at the grocery store it is some nicotine spray, basically just mint flavoured like the kind of spray you'd have to freshen your breath, but each spray contains 1mg of nicotine. In the directions it says, use one spray or two each time you have a craving. I used it quite a lot at first, but now I'm finding I only do maybe 10 or 12 sprays per day.
The fast absorbtion is I think the reason it works well, it's similar to e-cigarettes, but I like it because it's very inconspicuous, you just spray and be done with it.
Honestly smoking I had lots of anxiety, sometimes I'd feel my heart thumping in my chest, since stopping I feel way more relaxed and calm, kind of hard to describe exactly but just much healthier overall. So even if nicotine in spray form isn't good for me, I'm certain it's better than nicotine in smoke form breathed into my lungs 20 times per day. And it isn't something I intend to do forever, I see myself just eventually getting down to zero, I think about it less everyday, and use is less frequent. But at the same time, if it were either do this my whole life or smoke, it's surely better as an option.