καπνιστέον
From LSJ
ἄλογον δὴ τὸ μήτε μάχης ἄρξασθαι μήτε τοὺς φίλους φυλάξαι, ἐὰν ὑπό γε τῶν βαρβάρων ἀδικῆσθε → It is irrational neither to begin battle nor to guard the friends, if you are ever wronged by the foreigners
English (LSJ)
A one must smoke, 'gas', τοὺς ἐν τοῖς μετάλλοις ὄντας Ph.Bel.99.18.
Greek (Liddell-Scott)
καπνιστέον: ῥημ. ἐπίθ. τοῦ καπνίζω, δεῖ καπνίζειν, Φίλων Μαθ. σ. 99.