Carneades was in the habit
While looking up Lucretius' use of the word "Verā́trum," I found this info about Carneades.
Pliny, Natural History, 25.21:
"In former days hellebore was regarded with horror, but more recently the use of it has become so familiar, that numbers of studious men are in the habit of taking it for the purpose of sharpening the intellectual powers required by their literary investigations. Carneades, for instance, made use of hellebore when about to answer the treatises of Zeno... In Italy the name given to it is 'Verā́trum.' These kinds of hellebore, reduced to powder and taken alone, or else in combination with radicula, a plant used, as already mentioned, for washing wool, act as a sternutatory, and are both of them productive of narcotic effects."
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Aulus Gellius, Attic Nights 17.15:
"When Carneades, the Academic philosopher, was about to write against the books of the Stoic Zeno, he cleansed the upper part of his body with white hellebore, in order that none of the corrupt humours of his stomach might rise to the abode of his mind and weaken the power and vigour of his intellect; with such care and such preparation did this man of surpassing talent set about refuting what Zeno had written."
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Amusingly neither Gellius nor Pliny say Carneades completed any writing refuting Zeno... only that Carneades wanted to start writing... and then drugged-up on "narcotic mind-clearing" hellebore!
