Drugs mainly affect the brain. After taking drugs for a few days, your very addicted to the substance, and want a lot more of it. If you don't get more, it kills you confidence and well being, and this leads to depression and other seriously bad thoughts.
Answer: She raises the stakes, giving the audience someone else to care about increases the suspense level.
Explanation:
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Because they're other people who might need it, it's like how you shouldn't waste your food.