I suppose, if the speakers are really nice, you could consider it a "patina" as they say on Antiques Roadshow :^) Do NOT refinish, it will ruin the "value"!
I used to service a lot of loudspeakers in the old days. You could always tell if the speaker was owned by a smoker- of course they would smell, but the suspensions of the drivers would usually be rotted long before their time.
The same is true of the rubber parts in turntables and tape machines!
When they cough it really hurts my ears; not to mention the raspy growls of the upper mid-bass and the wrinkles on the finish is really aesthetically gruesome. But the worst part is the irritating whine from the tweeters when they are smoke-deprived....drives a man crazy.
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