the drugs and injections are used to heal players but if a criminal/LEO use them in combat
can he aim while his screen is moving and turning around ?
no , he will get shot instead of shooting what makes it more easier for the opponent to kill him.
so this is more likely the drugs/injections will help you in getting killed.
Iam sorry -1
but they can make the beer and other stuff like these make you drunk...
as it doesn't affect you in combat since you don't drink /beer or other stuff while in combat.