Humans can get hooked to anything that triggers a 'feel good' response, be it gorging on food, drugs, gambling or even exercising.

With all the grinding, long hours and stressful situations "modern life" puts us through, it's not difficult to see how people more and more just want to hit the 'instant gratification' button instead of actually getting better by working their underlying issues.... there is simply no time for downtime and relaxation anymore, everyone is just too busy doing "actual important stuff", which is a sad matter of affairs.