Patients with a mild exposure may present with dyspnea, epistaxis, pain, coughing, or tachypnea. 10,13 More serious exposures may result in bone marrow suppression and leukopenia
[centerforhealthsecurity.org]
Other symptoms include nasal congestion, sinus pain, hoarseness, coughing and in extreme cases respiratory failure.
[militaryhistorynow.com]
Respiratory tract: runny nose, sneezing, hoarseness, bloody nose, sinus pain, shortness of breath, and cough within 12 to 24 hours of a mild exposure and within 2 to 4 hours
[mashable.com]