My ex-coworker used to come in obviously sick. “Yeah I’ve got all the NyQuil symptoms.” He would then proceed to cough all over the shared workspace for 4 hours, inevitably coming to the conclusion that he needed to go home. Not coincidentally, this was also about the time that volume picked up and the real work started.
He also got mad at me once when I didn’t congratulate him for cutting back on smoking after he spent two+ weeks in the hospital for COPD.
Thankfully we no longer work together anymore. I quit and he died in his 50s.