Natyashastra
इष्टघ्राणे तथोच्छ्वासे दीर्घोच्छ्वासां प्रयोजयेत् । विकूणिता च कर्तव्या जुगुप्सायामसूयादिषु ॥ १३६॥
Socchvāsā (deep nose movement) should be employed during the perception of a pleasant fragrance or deep breathing. Vikūṇitā (wrinkled nose movement) should be used in situations of disgust, envy, and similar emotions.
english translation
iSTaghrANe tathocchvAse dIrghocchvAsAM prayojayet । vikUNitA ca kartavyA jugupsAyAmasUyAdiSu ॥ 136॥
hk transliteration by Sanscript