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.