What happened to soldiers who breathed in gas during World War 1?

Soldiers who inhaled gas during World War I often suffered severe respiratory injuries, leading to conditions such as chemical pneumonia, chronic lung damage, and long-term health issues. Many experienced immediate symptoms like coughing, choking, and difficulty breathing, while others faced lasting psychological effects, including anxiety and post-traumatic stress. The use of chemical weapons led to significant advancements in medical treatment for gas exposure, but many veterans continued to live with the consequences of their injuries long after the war ended.