Answer:
Studies show that laughter can have a positive effect on your health.
Explanation:
"Affect" is used when describing how something can impact something else:
"How did World War II affect the United States?"
"Effect" is used when describing the impact of another thing, like "cause and effect":
"The effect of the Cossacks was obvious; people lay on the ground, unmoving, next to their burnt houses and destroyed possessions."
Hope this helped!
