Marijuana thrives at high altitudes as that is where it first grew, it's origins have been traced back to Asia , it (along with spices and other goods) made its way to Europe along the "Silk Route" , from England it was transported to Canada and the US.

2700 BC First written record of cannabis use, in the pharmacopoeia of Shen Nung, one of the fathers of Chinese medicine.

1563 Queen Elizabeth I decrees that land owners with 60 acres or more must grow Cannabis else face a £5 fine.(It's a pity Queen Elizabeth the second doesn't do the same) :thumbsup:

1606 British take Cannabis to Canada to be cultivated mainly for maritime uses.
1611 British start cultivating Cannabis in Virginia.
1619 Virginia colony makes Cannabis Cultivation Mandatory, followed by most other colonies. Europe pays Hemp bounties.
1631 Cannabis used for bartering throughout American Colonies.
1632 Pilgrims bring Cannabis to New England.
1753 Cannabis Sativa classified by Linneaus.
1776 Declaration of Independence drafted on Cannabis paper.

You gotta love that 1776 , I bet the White House don't shout too loudly about that fact.