Final answer:
The release of a report linking ice cream to tongue cancer would have a negative effect on the market for ice cream, leading to a decrease in demand and a leftward shift of the demand curve.
Step-by-step explanation:
In the market for ice cream, the release of a report linking ice cream to tongue cancer would have a negative effect on the demand for ice cream. This means that consumers would be less willing to buy ice cream due to concerns about its health impact. When drawing a new curve to show this effect, you would shift the demand curve to the left, indicating a decrease in the quantity demanded at each price level.