[throwaway1]

It's funny how important perspective is. They seem incurious because everything is going on in their head. I'll say without thinking twice that ganja tends to make you less observant of the fine details of all of your surroundings (which would be overwhelming at times otherwise) but instead makes you focus on very specific things.

There have been some studies that show a huge spike in activity in the frontal lobe during the onset of cannabis effects. It's been suggested this contributes to interesting time effects noted by smokers, especially inexperienced ones: So much thought occurs compared to regular activity that passage of time seems to slow significantly.

[Nursie]

I don't believe this, having observed it first hand on many occasions.