From this infographic, it may be correct to assume that Americans consume more cannabis than Canadians on holidays, especially 420. However, let's not forget that 4/20 traditionally has been one of the main days when cannabis advocates tend to organize gatherings to protest against the war on drugs and push for federal legalization. Since consumption of cannabis has been legally federally in Canada for over 3 years now, perhaps it's not as important a day for Canadians anymore as it is still in the US, where cannabis is still illegal federally. Also, regulations on promotions are quite stringent in Canada, while dispensaries in the US are able to offer more discounts and sales promotions, especially on 420. Both these factors likely impact the higher rate of cannabis consumption on holidays in the US as compared to its neighbor up north.