I think part of that isn't the symptoms of the drug but the culture surrounding it. In most places its illegal or at the very least frowned upon, so being one who does this regularly makes you perceived by some parts of society as some sort of black sheep. People wear the black sheep badge proudly and can be arrogant and in your face about it. Just look at how techies act online. Smoking pot, like knowing stuff about technology, makes you 'in the know' relative to the rest of society, and can make you feel superior that you are taking part in something that most people will never or might outright refuse to experience.

Even in parts of the US where its been legal to smoke pot for some time like California, the social stigma of meeting up for drinks at a bar regularly and meeting up to smoke pot regularly are not equivalent. Your employer might even drug test you still.