Researchers surveyed 1,218 undergrads about their most favorite activity and their second favorite.
The researchers found that having two passions is better than having one. By this you enhance happiness, well being, and positive moods. You can even separate the same period of time into two passions instead of one. It still increases your happiness and well-being.
Bear in mind that we don’t know if happier people are more likely to have multiple passions. Maybe many passions cause extra happiness.
Schellenberg, B. and Bailis, D. (2015). Can Passion be Polyamorous? The Impact of Having Multiple Passions on Subjective Well-Being and Momentary Emotions Journal of Happiness Studies, 16 (6), 1365-1381