Or maybe you're talking to someone smart enough to realize that just because a bunch of things are in the same category, that doesn't make them equivalent.
In many US states, including the ones most frequented by HN's target demographic (CA, WA, OR, CO, etc.), being a legal user is much less of a pain than being an illegal user (and you get much better choice in goods too!)
That may be true but is irrelevant. The original claim was that someone talking about the dangers of marijuana while drinking is an idiot.
My claim is that talking about one says nothing about their knowledge of the other since they are different things. I can talk about the dangers of bear attacks while driving a car. I can talk about the dangers of flying while using a ladder.
That doesn't make me a hypocrite, it just means I'm not spending every waking moment sorting my activities and discussion points by aggregate danger level.
Not that I'm saying you're any of those things, mind you, but your analogy was fairly flawed. :)