Changes

== History ==

== History ==

Tobacco was exported by [[John Rolfe]], (husband of [[Pocahontas]]).  It became known as a [[cash crop]]. The negative effects of tobacco such as [[lung cancer]], [[bronchitis]] and foul breath are widely accepted today. Tobacco companies have genetically modified tobacco plants and added toxic [[chemical]]s to their products to make them more addictive, thus making the modern cigarette much more toxic than the original cultivated plant.

Tobacco was exported by [[John Rolfe]], (husband of [[Pocahontas]]).  It became known as a [[cash crop]]. The negative effects of tobacco such as [[lung cancer]], [[bronchitis]] and foul breath are widely accepted today.<ref>One of the first papers to recognize that smoking causes lung cancer was published in 1957.[http://cancerres.aacrjournals.org/cgi/reprint/17/10/981.pdf]</ref> Tobacco companies have genetically modified tobacco plants and added toxic [[chemical]]s to their products to make them more addictive, thus making the modern cigarette much more toxic than the original cultivated plant.

== Nicotine ==

== Nicotine ==