What about Tesla’s Willpower?
While he gambled and played billiards, Tesla also took up several habits, including becoming an obsessive smoker, burning fifteen or twenty big black cigars every day.
He slowly realized the practice was damaging his health, so, according to Tesla, “my will asserted itself and I not only stopped but destroyed all inclination.” He also gave up coffee, worried that it was leading to heart trouble, although he confessed this particular discipline proved most difficult.
He later admitted these denials preserved his life, but, more tellingly, he “derived an immense amount of satisfaction from what most men would consider privation and sacrifice.”
Tesla: Inventor of the Modern