They all work by increasing dopamine. But 'Addictive potential' does vary by drug, and by the person [1]. 'All substances of abuse self-administered by humans

They all work by increasing dopamine. But 'Addictive potential' does vary by drug, and by the person [1]. 'All substances of abuse self-administered by humans that can result in addiction are believed to exert their reinforcing effects by increasing DA in the nucleus accumbens (NAc)' https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3050051/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3050051/