How did the high demand for tobacco led to labor shortage?

Spain introduced tobacco to the Europeans, and it became a heavily traded commodity. A popular habit of smoking was forming . Following the industrial revolution, cigarettes became hugely popular worldwide. In the mid 20th century, medical research demonstrated severe negative health effects of tobacco smoking, which led to a sharp decline in tobacco use thus no more people buying tobacco meaning the tobacco farmers were out of work.

Explanation:

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according to worldatlas.com, the u.s. has an 86% literacy rate.