There may be some truth to this, that marijuana can’t get you to the same point of loss of control that alcohol can, but I don’t know how much research has been done on the subject. Speaking from experience, however, “blackouts” or “missing hours” certainly can happen with alcohol, and at a relatively small quantity imbibed for some people, but I’ve never heard of this happening with marijuana. Perhaps it does, as I’m not a marijuana user and I don’t spend much time with people who use large quantities of it, but anecdotally I know that I hear of and have seen alcohol blackouts with some regularity where large amounts of alcohol are consumed, but never anything similar with marijuana.
That said, the moral limit for intoxication is below “blackout”, and marijuana would seem to cross that limit after a certain amount.
Marijuana doesn’t cause the impulsiveness that alcohol does (this has been verified in studies), but it can hinder reason, which is the cut-off point for moral use. If you’re at the point where you can’t think coherently (to test this, see if people who
aren’t using pot can follow your thinking process) then you’ve gone too far, but this point isn’t necessarily reached by one toke, or even one whole joint. It all depends on the strength of the marijuana in question, and the amount consumed.
Peace and God bless!