Comparison of toxins 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 |
NNK, N′-nitrosonornicotine (NNN) and 4-(methylnitrosoamino)-1-(3-pyridyl)-1-butanone; NNN, N′-nitrosonornicotine.