That is completely wrong.
The point is to stop smoking, not to stop taking nicotine. Those are two different things, which is the crux of the way in which you are wrong. You're treating them as the same thing and they clearly aren't.
There are two different addictions in play - the physical addiction to nicotine and the psychological addiction to smoking.
Taking nicotine in some other way allows the addict to address the two addictions seperately rather than having to address both together. That can make it easier to break the addictions, or at least the addiction to smoking (which is by far the worse of the two - nicotine is far less dangerous, doesn't make you smell and doesn't harm other people).