In the long term, the most effective means of reducing smoking may be

The answer is "changes in societal norms and attitudes toward the habit".

In the long term, the best methods for decreasing smoking might be changes in societal standards and states of mind toward the propensity. For example, numerous urban areas and towns have made smoking out in the open spots illegal, and enactment restricting smoking in spots, for example, school classrooms and structures, in light of solid well known is being passed with expanding recurrence.It has been recommended that long-term reduced smoking may straight forwardly gives benefit to health, in spite of the fact that the advantages are little contrasted and suspension. 

Its stage conventional