...Oriana Josseau Kalant, in an article for The International Journal of the Addictions presents one solution to this dilemma by analyzing the "Tilden's extract" that was Ludlow's source of the drug:

Ludlow consistently talked of "hasheesh" but in fact he took the solid extract of Cannabis Indica which was roughly twice as potent as the crude resin and ten times as potent as marijuana. A rough calculation shows that his intake was equivalent to about 6 or 7 marijuana cigarettes per dose, i.e. at the hallucinatory rather than at the euphoriant level prevalent in contemporary North American use....
Kalant, O.J. "Ludlow on Cannabis" The International Journal of the Addictions 6(2) June 1971, pp. 309-322
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