Well you only need to hold it in for like 5 seconds because after that time all the THC is in your lungs, and any longer is just holding excess smoke in.

So you were probably just blowing back dormant smoke.
Dick Justice Reviewed by Dick Justice on . all smoked out?? ok.. made a bong... and i'm hittin it... hydro.. red clown, they call it.. very soon, it starts kickin in... til i'm feelin good n shit.. then I take another hit, hold it in.. exhale.. and this bigass cloud of smoke comes out, thickass smoke, as if it the shit didn't even settle in my lungs. is there actually a "all smoked out" scenario? cus i see i inhaled that shit n blew out practically the same amount, n i dun wanna waste my shit. Rating: 5