Was an explanation ever given for why GG had that nagging cough? I had always assumed it was from Mace crushing his chest in the clone wars microseries, but I dont know if that still holds true.
The explanation now is that the cybernetics implanted in Grievous' lungs irritate the tissue, which gives him that trademark cough: https://i.imgur.com/wbTphsL.jpg -Visual Dictionary (New Edition)
Same source also states that Grievous' cybernetic transformation/enhancements were all elective. Etc.
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"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."
It was cooler when Mace' force crush was the reason. Womp womp
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"The Daemon lied with every breath. It could not help itself but to deceive and dismay, to riddle and ruin. The more we conversed, the closer I drew to one singularly ineluctable fact: I would gain no wisdom here."