“…What has not been well studied, however, is the incidence of dependence or habit formation of those exposed, of the strength of the habits, and of the tolerance and withdrawal characteristics, with the exception of sporadic studies and case reports (see, for example, GLATT, 1968GLATT, , 1969ESSIG, 1969;FINER, 1970;CHAMBERS et aI., 1972;CROWLEY et aI., 1974 b;PATCH, 1974;GREENBLATT and SHADER, 1974a, b;WEISE et aI., 1973;WEISE and PRICE, 1975;GREEN and MACDONALD, 1976;WESSON and SMITH, 1977).…”