Obviously you can put enough of anything into your body that you can't stand up, but for normal amounts it's safer than driving drunk, on your phone, texting, etc. There are several researchers who have found that it's so safe that in double blind studies they couldn't tell the difference between the sober group and the stoned group, i.e. they found zero harm at all. The ones who do find some impairing effects say they are minimal.
> Obviously you can put enough of anything into your body that you can't stand up, but for normal amounts it's safer than driving drunk, on your phone, texting, etc.
The problem I have with what you are stating is that you hand wave over "normal amounts". What is a normal amount. I've seen one toke of weed be enough to lay someone out for a half hour, I haven't seen that from one sip of a beer.
Source? I've seen stoned people that couldn't stand up, much less drive.