Figure 1 | Scientific Reports

Figure 1

From: Room air constituent concentrations from use of electronic nicotine delivery systems and cigarettes using different ventilation conditions

Figure 1

Comparison of mean cumulative (± SD) nicotine, propylene glycol, glycerin and formaldehyde concentrations measured after 4-h of ad libitum product use for all Groups. Group I—Blue bars, Group II—Orange bars, and Group III gray bars. Missing bars indicate that the cumulative mean concentrations were below baseline values.

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