If you want to play smart of course, play with profits, and you can save your bankroll to play the other day, therefore you will be disciplined and not throw your money in a short time.
This is the best thing to do and i like that way because i get get out in gambling nowadays once i enter and play when i won i play it again its kinda i felt crazy and greedy to earn much more than what i have and including my bankroll to roll it up.
for me there's no way you can gamble smartly. all you can do are to avoid gambling as soon as possible as the smartest action. especially when you looking for profit and keep gamble the amount that you have won? that would never be a good ending for sure. you would receive more and more problem , get addicted and there no easy way to get out of it.