I think driving on the left is a false analogy. We don't drive on the left because we enjoy it or because it makes us happy. However, if we have consumed weed i

I think driving on the left is a false analogy. We don't drive on the left because we enjoy it or because it makes us happy. However, if we have consumed weed in the recent past, that is a strong signal that we have a preference for weed and would pursue the experience again in the future. If you and I had a betting market that allowed us to bet on an individual's likelihood of consuming weed while in the United States, knowledge of that person's past behavior in consuming weed would be a strong piece of evidence that you could use when making a bet. Anybody consuming weed today is more likely to have consumed it in the last 30 days than somebody that is not consuming weed today.