Even a missed shot kicks in eventually. They don't somehow dissapear, it just takes longer for them to work their way into your blood stream. I've found missed shots similar to an IM shot, you lose the rush sadly and maybe slightly less intense since it doesn't peak so suddenly, but it still has a high BA and will get you nicely buzzed.
missed shot= abcess (not always but high chance) also an unsightly bump that can last for days.

