There are 9 different Delta-9 THC isomers, and the exact chemical makeup/potency of each strain of Marijuana
is different. However, the in-and-out high experience you are explaining seems more likely to just be a case where you weren't as familiar with cannabis
as you are now, and were unaware you were high, when you actually were.
For example, the first time SWIM
smoked cannabis, he and a good friend smoked 4 whole bowls of premium cannabis. During and immediately afterwards, he felt sober as could be... 15 minutes later, SWIM was absolutely stoned and fast-approaching unintelligibility.