It's possible to genetically engineer plants to produce caffeine. They did it to tobacco, of all things, because caffeine is a natural pesticide: http://www.mo

It's possible to genetically engineer plants to produce caffeine. They did it to tobacco, of all things, because caffeine is a natural pesticide: http://www.monsanto.co.uk/news/ukshowlib.phtml?uid=11404 http://www.monsanto.co.uk/news/ukshowlib.phtml?uid=11404