RE:how big is the market It is estimated that around 15% of the Canada population will use canabis from time to time. That equals to 5 500 000 users. They should spend in average $1000/year, which gives $20/week or about 2g/week. This gives 572 000 kg/year or 572 tons. That's the numbers I work with to take my investment decisions.
P.S Note that edibles are the big market here with an higher selling price. Potential exportation must be added to these numbers.