The Compendium of Caraka 1.5.50

1.5.50

dvātriṃśadaṅgulaṃ snehe prayoge 'adhyardhamiṣyate/
&ṛju trikoṣāphalitaṃ kolāsthyagrapramāṇitam//

Thirty-two finger-breadths for unctuous [smoking]; for habitual use, one and a half [times twenty-four] is prescribed; / straight, with three rings, tapering, sized at the tip like a jujube stone,