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Cannabis from unknown sources often contains high THC levels, so take it slow

But even where genuine products are made there can still be illegal acts

The formulas shown below use simple math to derive Transaction Chargeback, Volume Chargeback and Refund Ratios: Add total monthly number of chargebacks and divide by total monthly number of transaction

The 2 models included binary dummy variables to model the effect of the new labels (coded as 1 for March 2012 to December 2013, and 0 otherwise), the sustainability of the effect (coded as 1 for October 2012 to December 2013, and 0 otherwise), the seasonal January effect to account for the increase in number of calls in the new year, and the Driven to Quit Challenge in February 2010, 2011 and 2012, as well as Ontario tobacco prices as a continuous variable