Why did tobacco become jamestown first cash crop

" Officials of the Virginia Company established the colony at Jamestown to make a profit.  They expected the colonists to find marketable natural resources, develop industries or produce an agricultural product that would succeed in making money for the colony and its investors in England.  After finding no precious metals and failing at such endeavors as glassmaking and silk production, John Rolfe finally succeeded by growing a sweet variety of tobacco which was all the rage in England.  In other words, consumers were waiting!  This meant land became a very important resource since a great deal of land was required to grow tobacco.  Because growing tobacco also required a lot of hard work and labor, more people (human resources) were needed to work in the fields.  The more workers one had, the more tobacco they could grow and the greater the profit they could recognize.  Indentured servitude met this need at first, but later slavery became entrenched as an institution in Virginia, because of the labor force it provided the colonists for tobacco production.  It didn’t take the colonists long to realize that economic specialization would be the way to go, and tobacco became a cash crop for the colony. "

theres no poem plesae include that

can you tell me the answers to this