Pufing or Puffing: How To spell?
The word Pufing is misspelled against Puffing, an adjective meaning "from Puff, v. i. & t."
Puffing has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Pu & ing which should not be misspelled with single 'F'
Wrong Spelling:  Pu-f-ing  Correct Spelling:  Pu-ff-ing 
Check more misspelled words of Puffing to spell it correct.