Pot alters people in a way that science has yet to define, but we see it over and over as they change, their dress changes, music changes, posters change, habits change, personalities change.
Pot heads can usually identify each other, and feel a kindred group feel even when around strangers who are also pot users.
Who's "we" - you and the mouse in your pocket?
see it over and over as they change, their dress changes, music changes, posters change, habits change, personalities change.
This may be true of the pot users you know and know about - but you may well know people who are users without you knowing it, and in either case your personal experiences of pot users are not validly generalizable to the entire population of pot users.
And are you even sure that the pot use preceded the changes you've seen, rather than them all occurring as a general change in way of living?
Pot heads can usually identify each other, and feel a kindred group feel even when around strangers who are also pot users.
Has every pot user you know confirmed this to you? Do you know for a fact that their identifications are always correct? If true, is this any less true for, say, cat lovers? Or boozers?