It's also much easier to consume a much larger dose by edible than by smoking. Smoking is sort of self-regulating - if you take hits too quickly, you'll cough too much to be able to continue smoking without taking a break.

In addition, weed is much more potent than alcohol. With alcohol, most people roughly have the same experience. With weed, give it to 10 different people and they'll have 11 different experiences with it.