| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | mustard gas | Western countries | Used as a chemical weapon in World War I and considered a banned, dangerous substance. | 1 |
| 2 | mustard gas | Western countries | Used as a chemical weapon during World War I and banned by international treaty as a weapon of war. | 1 |
| 3 | mustard gas | Western countries | Associated with chemical warfare and military conflicts, banned by international conventions. | 1 |
| 4 | mustard gas | Western countries | Associated with chemical warfare and banned by international law. | 1 |
| 5 | mustard gas | Western countries | Associated with chemical warfare in World War I and considered a highly toxic and deadly weapon | 1 |