Learning new things is a lot safer, and ultimately a lot more satisfying.
Learning a more lasting new skill - be it playing guitar or learning to speak a foreign language - can equally harness the brain’s joy of learning new things, but leave you with something of permanent value, in a way that neither drugs nor video games ever could. It leaves you with a sense of fulfillment, which goes back to what pioneering psychologist Abraham Maslow called "self-actualization."
As Aristotle realized, there is a difference between the pleasures of the moment (hedonia), and the satisfaction that comes from constantly developing and living one’s life to the fullest (eudaimonia). In recent years, scientists have finally begun to study eudaimonia. Research suggests that the greater sense of purpose and personal growth associated with eudaimonia correlates with lower cortisol levels, better immune function and more efficient sleep. - CNN.com Blogs