Table 5 Side effects reported by study participants after e-cigarette use initiation
| Â | n (%) |
|---|---|
Side effects | Total |
 Sore or dry mouth and throat | 185 (6.2) |
 Headache | 261 (8.7) |
 Gingivitis/gum bleeding | 31 (1.0) |
 Dental problems | 48 (1.6) |
 Mouth or tongue sores/inflammation | 43 (1.4) |
 Black tongue | 51 (1.7) |
 Nose bleeding | 35 (1.2) |
 Cough | 540 (18.0) |
 Bowel problems (diarrhea/constipation/pain) | 5 (0.2) |
 Muscle cramps | 22 (0.7) |
 Dizziness | 88 (2.9) |
 Sleepiness | 73 (2.4) |
 Sleeplessness | 24 (0.8) |
 Heart palpitations | 11 (0.4) |
 Breathing difficulties | 57 (1.9) |
 Allergic reactions | 23 (0.8) |
 Chest pain | 119 (4.0) |
 Loss of appetite | 15 (0.5) |
 No side effects | 2004 (66.8) |
Did the above-mentioned symptoms resolve over time?1 | |
 Completely resolved | 426 (42.8) |
 Partially resolved | 501 (50.3) |
 Completely unresolved | 69 (6.9) |