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The global burden of death and disability attributable to drug users, remains a significant threat to public health for both developed and developing countries. This paper present a new mathematical modelling framework to investigate the effects of drug use in the community. In our model the transmission process is considered as a social contact process between the susceptible individuals and drug users based on the epidemiology principles. An epidemic threshold value, ܴ , is proposed for thedoi:10.22457/apam.591v19n1a4 fatcat:g54rpzapjrh55fpvpilipfden4