We searched through the published literature for information on the chemical emissions from ecigarettes.
We then used these chemical emissions to calculate the 24-hour direct exposure to
users and the 24-hour indirect (passive) exposure to non-users, with the following usage and
exposure assumptions, which were selected to produce worst-case exposure scenarios. For both
direct and indirect 24-hour daily exposures, we used a respiration rate of 20 m3/day.