About being precise in giving advice, more like.
If you constantly use the stimulants, the trooper's dependency marker will move to the right -> effect of further doses will be decreased. This returns to normal after a while, and also works
the other way round.
In other words, it is possible to use counter-stimulants to decrease dependency to mimimum (bars to the left until the white indicators move all the way there too) and then set the stimulants to maximum values, thus effectively turning your agents into superhuman killing machines (until the drugs wear off, that is).