“If they really wanted smokers to quit, they would continually reduce the nicotine content in cigarettes until there was none.”
Reduction cures do not usually work for strongly addictive substances like nicotine or opiates.
In one sens you’re correct, because those who smoke for the nicotine will continue to smoke, and might even increase their smoking to compensate for reduced nicotine intake.
However, if the nicotine were to be reduced to a point where there wasn’t that nicotine high, the number of people that would take up smoking would be greatly reduced.