Treat Cannabis like Alcohol
In Canada, alcohol is a controlled substance and excessive consumption can leave one under the influence and impaired. Therefore the sale and use of alcohol is controlled by age and its consumption is restricted to your home and/or a licensed location. Businesses do not allow employees on duty to be “under the influence.”
Tobacco is also a controlled substance, though with no risk of being “under the influence.” However, there are collateral health issues for people in the vicinity of users, so generally tobacco smoking is not allowed in the workplace, restaurants, many parks, etc.
Recreational and medical cannabis is also a controlled substance and excessive use can result in being under the influence and impaired. The sale and use of cannabis will be controlled by age. There is some evidence that second-hand cannabis smoke has medical side-effects.
It follows that the sale of cannabis should be controlled like alcohol; that is, it can be used only in private residences or licensed facilities locations. Employees under the influence (impaired/stoned) should face disciplinary measures.
Edible cannabis products and beverages infused with cannabis products, and medical cannabis, should follow the same regulations.
Bob Lewis, Ottawa