How tall is Vice Admiral Smoker?
All I found online was a forum thread on Oro Jackson which list the characters with confirmed heights according to the forum's OP. There is no one source for all this: I presume all this info comes from SBS and data books.

Anyway, Smoker is apparently 185 cm. This makes sense if we look at the picture below as Zorro's height is 178 cm before the time skip according to the volume 10 SBS.