Folks might notice my rather enthusiastic response to Jack so excellently putting up an Unofficial Forum in the form a snazzy link image to that very same place! Thank you very much, sir!/... I guess that answers the poll question then...
Plus: Carlita's expectoratingly insightful question: "If anything, happens if a leer catches a cold and still uses his sthenicon. And what would happen if a wit or a fulgar caught a cold? Would they just be miserable, or would their transplanted organs cause them trouble?"
Any of the H-c's more knowledgeable physicians would heartily recommend to any leer with a strong head cold to leave off using the sthenicon or olfactologue until the malady had passed. To ignore this advice can be both very messy (can you imagine a snotty sneeze inside a box), painful and will very likely extend the duration if not increase the severity of a cold. I guess that means, too, that hay fever suffers with dreams of leering best find themselves a new dream.
As to lahzars with colds, they suffer no more or less than everymen, though an exceptional fever might increase the risk of their mimeotes (inserted organs) vaoriating (spasming) - so again, a transmogrifier would suggest bed rest and avoidance of the use of one's potencies until better.