Finish the following sentence with the best choice: How long should you let wood chips smolder before putting food on grill?

Choices:
- Heat the wood chips for 10 minutes or until they start letting off smoke before putting food on the grill.
- Heat the wood chips for 60 minutes or until they stop letting off smoke before putting food on the grill.

Answer:
Heat the wood chips for 10 minutes or until they start letting off smoke before putting food on the grill.