Snifing or Sniffing: How To spell?
The word Snifing is misspelled against Sniffing, a noun meaning "A rapid inspiratory act, in which the mouth is kept shut and the air drawn in through the nose."
Sniffing has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Sni & ing which should not be misspelled with single 'F'
Wrong Spelling:  Sni-f-ing  Correct Spelling:  Sni-ff-ing 
Find more wrongly spelled words of Sniffing to spell it well.