The Collaborative International Dictionary of English v.0.48:

Puff \Puff\, v. i. [imp. & p. p. Puffed (p[u^]ft); p. pr. &
   vb. n. Puffing.] [Akin to G. puffen to pop, buffet, puff,
   D. poffen to pop, puffen to blow, Sw. puffa to push, to cuff,
   Dan. puffe to pop, thump. See Puff, n.]
   1. To blow in puffs, or with short and sudden whiffs.
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   2. To blow, as an expression of scorn; -- with at.
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            It is really to defy Heaven to puff at damnation.
                                                  --South.
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   3. To breathe quick and hard, or with puffs, as after violent
      exertion.
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            The ass comes back again, puffing and blowing, from
            the chase.                            --L' Estrange.
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   4. To swell with air; to be dilated or inflated. --Boyle.
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   5. To breathe in a swelling, inflated, or pompous manner;
      hence, to assume importance.
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            Then came brave Glory puffing by.     --Herbert.
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The Collaborative International Dictionary of English v.0.48:

Puffing \Puff"ing\,
   a. & n. from Puff, v. i. & t.
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   Puffing adder. (Zool.) Same as Puff adder
   (b), under Puff.

   Puffing pig (Zool.), the common porpoise.
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WordNet (r) 3.0 (2006):

puffing
    n 1: blowing tobacco smoke out into the air; "they smoked up the
         room with their ceaseless puffing"
    2: an act of forcible exhalation [syn: puffing, huffing,
       snorting]

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "puffing":
   asthmatic, blurb, breathing, breathless, errhine, expiratory,
   heaving, huffing, inspiratory, nasal, out of breath, panting, plug,
   pneumonic, pulmonary, pulmonic, respiratory, rhinal,
   short-breathed, short-winded, sneezy, sniffling, sniffly, sniffy,
   snoring, snorting, snuffling, snuffly, snuffy, sternutatory,
   stertorous, wheezing, wheezy, winded, write-up