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Comparison of toxicants levels between conventional and electronic cigarettes.
| Toxic compound |
Conventional cigarette (μg in mainstream smoke) [35] |
Electronic cigarette (μg per 15 puffs) |
Average ratio (conventional vs. electronic cigarette) |
|---|---|---|---|
| Formaldehyde | 1.6-52 | 0.20-5.61 | 9 |
| Acetaldehyde | 52-140 | 0.11-1.36 | 450 |
| Acrolein | 2.4-62 | 0.07-4.19 | 15 |
| Toluene | 8.3-70 | 0.02-0.63 | 120 |
| NNN | 0.005-0.19 | 0.00008-0.00043 | 380 |
| NNK | 0.012-0.11 | 0.00011-0.00283 | 40 |
