Nonsense. It has more than its full punch. When dealing with animals who have consumed marijuana, the effects last for days. I suspect the same is true of humans ingesting it.
No, CBD (cannabidiol) comes from the hemp plant, and is not psychoactive.
THC (tetra hydra cannibanol), which is psychoactive, comes from the marijuana plant.
The two plants are in the cannabis family, but they're quite different:
It’s got no psychoactive effects. None.