I was just thinking of something like this. If you get high and smoke again after 2 - 3 hours then you will get high again but for me at least it seems like I do not feel like I am getting high. I have come to the conclusion that it must be because there is no large difference. i.e when you smoke sober there is a large difference between your sober self and high self therefore you tell that you are high.

This leads me to your question. After a while you start to understand that when you are high you do act/think differently. Once you begin to understand what will change you can have a better grip on what you can and cannot do, like what that previous post said about going to the supermarket and interacting, but you also know that you cannot say write a final as easily.

So to answer more succinctly I don't believe you grow a tolerance that it doesn't affect you anymore but the first time the difference from sober to high was new, exciting and unknown. After smoking for a long while you being to understand what is going on.

P.S THC is shaped like dopamine, the chemical, or cell... that transports messages, and THC simply fits into the receptor sites preventing dopamine. If I mixed up something feel free to correct me.

Happy Toking