I think playing gambling in a smart way is only that way, in which we invest only that amount which we can afford easily to lose and the other point is that we do not have to invest all in one bet.
For me, betting in small amount in every part of a game is one of a good strategy, because I can lessen my loses and also I can play more times in gambling if I just play small amount. Because if you bet all of your money in one game, then loses, you will lose all of it and it's hard to recover from what you lose.