i think most people have this static, staring at pure black or dark colors, some have it on light ones aswell. i have it all the time everywhere, and have started a thread awhile back. i don't even think abotu it really, its not dehabilitating(sp?) and its just pronounced when i'm high. can listen to music and get trippy visuals tho, calidiscope type things.
never noticed it before weed tho.