Your view of addiction is incredibly simplistic. You are assuming that what one person can do, the rest of the population can do with a similar amount of effor

Your view of addiction is incredibly simplistic. You are assuming that what one person can do, the rest of the population can do with a similar amount of effort. This should be self-evidently false. Some people can stop addictive behavior with relatively little effort, other people need external help and tons of effort, and other people will literally prefer to die before stopping. The only way to say that the latter two groups "don't actually want to quit" is to redefine "wanting to" in terms of "being able to", which makes your argument circular.