The brain is 90% phospholipid. Higher intellectual functions such as speech, sight, hearing, thought, memory and emotion is in the final analysis a function of lipid metabolism. However just how those lipids churn in the brain that generate those higher intellectual functions is essentially unknown. If inquisitive free scientific research continues in the new millennium, perhaps just perhaps, mankind just might come to understand the biochemistry of human thought.
Those who rant that the introduction of fat soluble chemicals such as cannabis, that alter brain function is harmless, delude themselves and those they influence. If you are smart, you will keep away from marijuana and the people who use it.
We see first hand the results of alcohol and opioids on our offspring. Just common sense should warn us of the risks. Course common sense is pretty rare these days.