Please note “smoke rings” with no hyphen at [04.013] and [07.116].  The Chapter 8 quote refers to blowing them back in the Shire.

• 01.011 But I have no time to blow smoke-rings this morning.
• 01.012 and blew out another even bigger smoke-ring.
• 01.068 he sent a smaller smoke-ring from his short clay-pipe
• 01.068 Then Gandalf’s smoke-ring would go green
• 01.068 He was blowing the most enormous smoke-rings,
• 01.068 he loved smoke-rings –
• 01.068 of the smoke-rings he had sent up the wind over The Hill.
• 04.013 and blew smoke rings,
• 07.116 this is a splendid place for smoke rings!
• 08.092 besides blowing smoke-rings,

Update 2016.05.02: I have added the “food” tag, as blowing smoke rings has to do with smoking, using a comforting consumable.  Caveat lector.

Hyphenated in its sub-entry.

“smoke, n.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/182698. Accessed 21 September 2017.