Headaches from over exposure to nitro & TNT were common. The constant skin contact with the nitro acted as a low-level "patch" leeching a miniute dose of the heart stimulant(s) via skin contact.
There was a (highly irregular & frowned upon) "dodge" to get on sick call in the service. You pulled down a round & shared the cordite with your mates. One round could easily be "mislaid" during a range session with many shooters firing. A little under the tongue would make you look (& feel) like hell. You'd have sweats, discolored skin a temperature & an increased heart rate & pulse. It would wear off after about 30 minutes from removing the cordite. It would also kill you from heart failure if you over did it.
Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”