A10% increase in cigarette prices has been found to result in a decrease of smokers.

The correct answer should be around 4%. This implies that eventually if the prices skyrocketed there would be no smokers at all but that is wrong because the tobacco industry that has billions of dollars at steak would fail. The Tobacco companies pay millions of dollars of taxes so there is really no fear that the countries will keep supporting even though they might pretend to not support it.

What subject do you need with?