There's no such thing. You can't play gambling in a smart way, there are no strategies. Only luck, that's all you need to win. You never know when luck comes though, so we have to control ourselves whenever we're gambling.
Going for gambling only for entertainment must be one of smart way. But most of us are not ready for that. We all want to have profits from gambling, that is the reason gambling stays so smarter than gamblers.
That is correct. Every gambler knows that it is not for making money, but still they want to try their luck because they think can earn fast and easy money. If they play with a small amount or some fixed amount for the session, then it considered as a smart way to reduce the losses in gambling.