People aren't literally addicted to the habit of smoking, they're physically addicted to nicotine. It's pretty much unavoidable. Any smoker who tells you they just like the ritual, has been conditioned to think that by mentally associating the ritual with relief from the physical symptoms of nicotine withdrawal.

Sure, removing the nicotine isn't going to be an immediate barrier from continuing smoking. But the point is that once the person can no longer get nicotine from smoking, they will almost certainly make the decision to quit themselves. And that has the potential to be a more profound decision for them than simply having the product taken off the shelves and being told they can't have it.