What you said is true and rational.
The problem is getting someone under the influence of a mind altering drug to make a rational decision.
Some times I wonder who the crazy one is, those who can not make a rational decision under the influence of a mind altering drug, or those who expect them to.
Knowing it is impossible to make rational decisions under the influence, the only rational thing to do is to not get under the influence in the first place.
I can honestly say with out a doubt, in my youth, I was under the influence of mind altering drugs or alcohol almost on a daily basis. I'm talking serious usage.
I managed to make rational decisions. I can't tell how many times I pulled over to sleep it off because I knew I was in no condition to drive and I was totally wasted
I once fell asleep in the middle of the road after I stopped and got out of my car, a friend stopped and woke me up before I got run over.