John Stuart Mill disagreed with some aspects of Jeremy Bentham's utilitarianism. While Bentham viewed all pleasures as equal, Mill argued that some pleasures, like intellectual pursuits, are of higher quality than baser pleasures like substance abuse. Mill believed happiness, not just pleasure, should be the standard of utility. He also took into account human nature and well-being, rather than just quantifying pleasure. For Mill, true happiness involves things like meaningful relationships and intellectual fulfillment, not just momentary physical gratification.