I think if a person's "happiness every day" is "smoke crack and gamble in search of a short-lived rush", he needs to reevaluate, because that won't serve long term happiness.

OTOH, if a person's "happiness every day" is "do yoga, spend time with family, and work reasonable hours at a job he enjoys", then that's a good idea.

Ideally, the short term and the long term are reasonably aligned, otherwise you get problems.