How Many Anecdotes add up to Evidence?

Here's another 'anecdote' about what happened to a family after one of its members smoked cannabis. It's on the 'CONSERVATIVE WOMAN' site I've mentioned here before.

 

 

http://conservativewoman.co.uk/drugs-wrecked-my-sons-life-legalisation-would-be-a-disaster/

 

Beyond asking if any rational, responsible  person would or could  pursue cananbis legalisation or 'regulation' or 'decrminalisation' until such 'anecdotes' could be explained, I make no further comment.