Who took tobacco back to the
new world?

In 1571, a Spanish doctor named Nicolas Monardes wrote a book about the history of medicinal plants of the new world. In this he claimed that tobacco could cure 36 health problems. Sir Walter Raleigh introduced "Virginia tobacco into England.

Tobacco has a long history from its usages in the early Americas. Increasingly popular with the arrival of Spain to America, which introduced tobacco to the Europeans by whom it was heavily traded. Following the industrial revolution, cigarettes were becoming popularized in the New World as well as Europe, which fostered yet another unparalleled increase in growth. This remained so until scientific studies in the mid-1900s demonstrated the negative health effects of tobacco smoking including lung and throat cancer.

Answer is mass marketing.