src: “Researchers have also been able to confirm that a mouse subjected to a single act of aggression by one of its congeners showed signs of stress only if it had been previously exposed to nicotine,” the study said.
tgt: "Os pesquisadores também puderam constatar que um rato exposto a uma só agressão apresenta sinais de estresse só tiver sido exposto previamente à nicotina", indica o estudo.