Common effects [most people will experience these]

Alienation
Sounds a bit too nasty, but perhaps this is also the most unpleasant side effect. In short, after the destruction of the ego and seeing through the games people play in life (see Psychedelic Experience), you often start to feel alienated from non-trippers, because they simply cannot see through the games they play, and that there are more important things in life than running after pieces of paper with pictures of dead presidents on them. Also, since psychedelics are illegal, one has to constantly maintain their guard about what one says to 'non-enlightened' people; "what if my parents/neighbors/teacher/ boss finds out I use drugs?". Even with good non-tripper friends, the overwhelming experience which you have experienced, but they have not, forms a kind of barrier. There is no cure for this, other than time and the development of cynicism; and, of course, 'converting' your friends.

Common effects [most people will experience these]

Alienation
Sounds a bit too nasty, but perhaps this is also the most unpleasant side effect. In short, after the destruction of the ego and seeing through the games people play in life (see Psychedelic Experience), you often start to feel alienated from non-trippers, because they simply cannot see through the games they play, and that there are more important things in life than running after pieces of paper with pictures of dead presidents on them. Also, since psychedelics are illegal, one has to constantly maintain their guard about what one says to 'non-enlightened' people; "what if my parents/neighbors/teacher/ boss finds out I use drugs?". Even with good non-tripper friends, the overwhelming experience which you have experienced, but they have not, forms a kind of barrier. There is no cure for this, other than time and the development of cynicism; and, of course, 'converting' your friends.