Think about a circle of cannabis smokers, passing a joint. When new people come up to the edge of that circle, they don’t all pull in closer and make a wall with their shoulders — they open up the circle, they invite in the newcomer, and that is usually true even if they have never seen that person before. This is because one of the lessons that cannabis teaches us is to be kind, generous, compassionate — and radically inclusive. And because we understand cannabis very differently from alcohol. Cannabis is not a vice that can kill you; it is a medicine that heals you. When seen in that light, not sharing cannabis with somebody who needs it, if you can provide it, turns into a serious moral shortcoming.