A recent study published in the Journal of Experimental Biology by Claudio Lazzari and his team at the University of Tours, France, has uncovered that mosquitoes can be conditioned to link the smell of DEET with blood meals. Despite DEET's long-standing use as an effective insect repellent, its precise mechanism of action remains debated. Previous research indicated that DEET confuses mosquitoes by blocking their sensory response to host odors. However, the new findings suggest that exposure to DEET during blood feeding could lead to a conditioned response, where mosquitoes become more likely to bite after associating DEET with a meal. In controlled experiments, mosquitoes trained with DEET while feeding showed a significantly higher biting response to DEET in subsequent tests. This raises concerns that mosquitoes may actually be attracted to hosts with DEET if they are not repelled effectively. The implications of this study are significant, particularly as mosquito-borne diseases are on the rise globally. Understanding how DEET works could lead to improved repellents in the future.