Ros Davidson Reveals How Moves to Liberalise Canadian Cannabis Laws Have Only Worsened the Already Strained Relations with Their Sensitive Southern Neighbours

Flin Flon may soon have competition. The small town in Manitoba is currently Canada's cannabis capital. That is because Flin Flon is where thousands of 6ft-high pot plants are legally grown, deep in an old copper mine.

The farm, not exactly an underground operation, sells its crop to the Canadian government for use in the official five-year medical marijuana programme. Cannabis can be used to dull pain or help those with cancer or Aids recover their appetite for food.

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