Sentence:  Surprisingly, this analysis revealed that acute exposure to solvent vapors at concentrations below those associated with long-term effects appears to increase the risk of a <WSD>fatal</WSD> automobile accident. Furthermore, this increase in risk is comparable to the risk of death from leukemia after long-term exposure to benzene, another solvent, which has the well-known property of causing this type of cancer. 
Meaning of the word marked with <WSD> tags:  Causing death or destruction.