Eisenhower

https://www.whitehouse.gov/about-the-white-house/presidents/dwight-d-eisenhower/

Eisenhower quit Smoking, going from 4 packs / day to none for life - When asked how, he explained that he “developed a scornful attitude toward those weaklings who did not have the will power to break their enslavement … I nursed to the utmost ... my ability to sneer” ... https://twitter.com/oliveremberton/status/1580226845546803200