The word "snifted" is spelled as /ˈsnɪftɪd/. The IPA phonetic transcription of the word helps to understand its pronunciation. The first syllable "sn" is pronounced as 's' followed by 'n', then comes the sound of the vowel 'i' pronounced as 'ɪ', and the next syllable includes the sound 'f' and 't' pronounced as /f/ and /t/ respectively. The ending 'ed' is pronounced as /ɪd/. Thus, the word "snifted" is pronounced as "snift-id". It means to inhale air audibly through the nose.
Snifting-valve, the escape-valve of a steam-engine.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.