No, it's because it impares you differently. Being high and being drunk arn't the same. When you're drunk you can't keep a car between two lines, or walk easily. Weed effects your judgement more then you're motor skills. Their more likely to drive slow then anything else. I will say though that I tend to drive on "auto-pilot" after I smoke so I try to avoid it anyway.

Before loaf jumps down my throat, I'm not saying it's a good idea to use ANYTHING just for the purpose of LDing. I don't see anything wrong with seeing if things have an effect but like loaf said, don't use it as an excuse to do drugs or drink.l

I actually get pretty damn lazy and unmotivated when I drink. It's part of the reason I only drink every now and then with friends ( once every couple of months). I'm just more likely to say "screw it" then actually try.