The smoke from the Los Angeles wildfires smelled like plastic and was so thick that it hid the ocean. Firefighters developed instant migraines, coughed up black goo and dropped to their knees, vomiting and dizzy. Seven months later, some are still jolted awake by wheezing fits in the middle of the night. …Fernando Allende, a 33-year-old whose U.S. Forest Service crew was among the first on the ground, figured he would bounce back from his nagging cough. But in June, while fighting another fire, he suddenly couldn’t breathe. …doctors discovered blood clots in his lungs and a mass pressing on his heart. They gave him a diagnosis usually seen in much older people: non-Hodgkin lymphoma, an aggressive cancer. It would be unthinkable for urban firefighters to [work] without wearing a mask. But people who fight wildfires spend weeks working in toxic smoke and ash wearing only a cloth bandanna, or nothing at all.