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| Precipitating factor | n | % |
|---|---|---|
| Cough | 9 | 50.0 |
| Vomiting | 2 | 11.1 |
| Inhaled drug use | 2 | 11.1 |
| Intense exercise | 1 | 5.6 |
| Occupational inhalation of varnish fumes | 1 | 5.6 |
| Sudden increase in tobacco consumption | 1 | 5.6 |
| Unidentified | 2 | 11.1 |
