id="article-body" class="row " section="article-body" data-component="trackCWV"> Many popular gaming apps -- this is GSN Casino Slots -- draw their look and feel from slot machines, blackjack tables and Casino Slots the like. Game Show Network

Many worries about the future weigh on Brett as he works his way through a gambling addiction program.

The 21-year-old's biggest worry after his release from the three-month program in California: encountering people, places and things that might trigger his urge to gamble.

But they're nothing compared with the biggest threat he'll face: Casino Slots his smartphone, and the many casino-style games available with a quick tap at an app store.