Emotion is just a normal part but doesnt mean that it would affect luck chance for you to win the game. There's no factor that could affect your winning probabilities.
Yeah it's normal and in general doesn't affect the luck of the games we are playing at all nevertheless I believe that emotions also could become one of the factors to encourage winning probabilities. Why? In case someone is carried away by his emotions while gambling I'm pretty sure his calculations or decisions that he made at the time would be mess up the gameplay particularly in several card games such as BJ or poker with certain decks.
When emotions come first, you will lose your reasons and plan because you think that there will be no tomorrow and when you lose, you suffer more than you deserve because you have just realized what you have done. It is really important to keep on our mind when things are not going on our way since that's just how life is and everything will be fine when we are focused and let not emotion took over us or else we will suffer additional damage emotionally and mentally.