Key points are not available for this paper at this time.
John C. Ball, Carl D. Chambers, Marion J. Ball, The Association of Marihuana Smoking with Opiate Addiction in the United States, The Journal of Criminal Law, Criminology, and Police Science, Vol. 59, No. 2 (Jun., 1968), pp. 171-182
Ball et al. (Sat,) studied this question.