Astanga Hrudaya
उत्क्लेशनार्थं वक्त्रेण, विपरीतं तु कण्ठगे। मुखेनैवोद्वमेद्धूमं नासया दृग्विघातकृत्॥११॥
If Dosha from nose and head are not coming out, but are adhering, inhalation should be done first through the mouth to make them move; and later through the nose. when the Doshas are localized in the throat – inhalation should be done in reverse order- first by the nose and later by the mouth. The smoke inhaled (either from mouth or from nose) should be let out only through the mouth; if let out through the nose, it produces loss of vision -
english translation
utklezanArthaM vaktreNa, viparItaM tu kaNThage। mukhenaivodvameddhUmaM nAsayA dRgvighAtakRt॥11॥
hk transliteration by Sanscript