How does the tobacco crop ruin land?

During the colonial period, little care was taken to preserve the soil. Land was cleared by burning which released a lot of potassium and phosphorus nutrients into the soil. Once those nutrients were depleted along with the nitrogen in the soil, the early settlers simple cleared more land and repeated the cycle. Much later farmers began to rotate crops so they had less negative impact on the soil. And they also began to fertilize the soil with animal manure.

The soil was "ruined" by poor farming practices but if you were to check those lands now they would be very productive.

Nicotine or the tabacco plant in itself requires massive amounts of water, and other nutrients to stay alive. The plant "ruined" the soil by taking all of the important nutrients away from the soil. It lef the spoil useless so to speak.

Only to the same extent cotton, corn or any other monocrop agriculture does. Soil depletion happens with all of them. Because Tobacco prefers lighter sandier soils and involves more traffic in the field it is normally more noticeable.

Don't believe everything they teach in school.

its all lies..