Irfan Rahman’s laboratory sits at the end of a long hallway on the third floor of the University of Rochester’s School of Medicine and Dentistry. Inside, Rahman and a team of researchers take apart e-cigarettes. They analyze the liquids that the devices turn into inhalable vapors in an effort to figure out exactly what those vapors are made of. The lab’s work has taken on growing importance as the number of deaths and injuries attributed to e-cigarettes across the country continues to rise. “We