In gambling the result is determined at least partly by chance, you can gamble in a smart way, there is just ways and strategies to make your chances for win higher, and for that usually you need rich bankroll. My personal opinion that not all the games are designed to play in some special smart way, there is no smart way in almost all machines, only sportbetting and poker are two games where we can count on some better chances for win.
Certainly fans of gambling will have a different opinion but I would like to hear from how positive and games and winnings. I very rarely met people who would normally make money on gambling. As a rule, it turns out that it grew much less than what to wipe.