First, because I stayed awake multiple hours with no effect other than drowsiness. That dose is enough to cause psychotic symptoms if it had be processed by my liver properly. The point is that eating cannabis largely doesn't effect me the way it does a normal user. I am not aware of people with a genetic predisposition to not processing alcohol, but with cannabis it is a common phenomena.
Secondly, because they a different chemicals and your comparison is bad.
But you aren't here to understand the difference, you're here to be a little prick and pick a fight because I made you feel bad somehow. "Pray tell"? Did I ruffle the feather in your fedora? Grow up.