You know, we have disagreed a lot here, but I actually get the impression we are on the same page.
I am little confused though, because you have suggested that driving whilst is okay (actually safer), but driver impaired isn't, and now that high equals impaired.
So I am not sure what you are really saying.
I absolutely agree that more research must be done. But drinking and smoking are inherently different. Having a beer or two is not the same as having a smoke. Getting high is pretty much instantaneous. Getting drunk isn't, and the process is different.
RE: This highlights gov't hypocrisy perfectly!