See, for example, GoodeErich, “Multiple Drug Use Among Marijuana Smokers,”Social Problems, Vol. 17, Summer, 1969, 48–64.
2.
StanleyE. Grupp, “Multiple Drug Use in a Sample of Experience Marihuana Smokers,”The International Journal of the Addictions, Vol. 7, 1972 and “Experienced Marihuana Smokers and Receptiveness to Heroin,” unpublished.
3.
See, “Multiple Drug Use in a Sample of Experienced Marihuana Smokers.”
4.
Forty (44 per cent) of the 90 subjects had extensive experience with at least one drug other than marihuana.
