The different effects produced in different countries depend, according to Abdull on individual conditions, arising from differences in personality, education and environment, as well as on the kind and quality of the preparation used. Other facts can certainly be added, e.g. reaction type, racial influences, etc. Whilst in the Americas, for instance, excitation, violence and crime have frequently been observed, in the Near and Middle East, particularly in Egypt, the result of taking cannabis is quietness and even anxiety without motivation; here the cannabis consumer is a coward.

Carstairs also draws attention to the fact that discrepancies in the description of the effect may be due, at least in part, not only to varying concentrations, but also to combination with other drugs.

Brazilian authors agree with this view. 

In all observations and conclusions, it should be borne in mind that there is a great difference between the effect of cannabis (i.e., the resin itself, known as charas, hashish, chira) and that of the leaves and flowering tops (known as bhang ganja, kif, takrouri, daga, marihuana, maconha, etc.), the former being about eight times more toxic (see also p. (231    

This great difference might perhaps be one explanation among others of the fact that, as mentioned earlier,(50)there are SOMB observers who do not consider cannabis to be as dangerous as it in fact is.