http://www.telegraph.co.uk/news/newstopics/howaboutthat/8331817/Worlds-hottest-chilli-grown-in-Grantham.html
Way back when the men who served in Asia in the late 1960's came home with seeds for growing the hot peppers and their family's loved them.
Some in the south west began to grow this chillies and found a huge market for them. Strange that those in the mid-west due to I believe soil and climate conditions harvested the same chillies but with less of a bite, more mellow. In new England this same plant grew to be sweet at first then turned into good Hots in the mouth.
Same plant, same seeds, but the growing conditions put a spin on taste and heat.