I can't help feeling that's rather pejorative: even if it doesn't simply alienate the person in question, it would tend to affect their self-confidence by undermining what can be a very difficult thing to overcome by dismissing it as a lack of willpower. I'm not saying some people don't use it as an excuse, but it can be a real problem for others.
but its pretty much true that for most people who can't overcome their addiction on their own is because they lack the self determination to do so. this is not the case with true addiction, which is when the body becomes physically ill without the substance rather than getting aggitated or headaches from minor withdrawl.
my mother has tried to quit many times, what it comes down to is that its easier for her to start smoking again than it is for her to overcome the irritations and withdrawls. thats called having a weak will, she'd take the easiest option knowing it was a bad decision rather than sticking to her determination for a few weeks.
with the exception of things like meth and real addiction where the person could very well die of shock from major withdrawl, addiction in the light and missused definition is much like the lays potato chip challenge: can you take just one? its a matter of will power. or deciding to believe that you have no control over your destiny and you have to accept that you are forever a smoker, or a drinker as this last sentence is what AA preaches.
a gum, patch or any other replacement will not decide for you whethor or not you will never smoke again. thats why they often fail, because people expect the problem to be solved for them.