Drug Types. Drug dealer motivation is traditionally attributed to greed or social pressures. Researchers R. Highland and D. Dabney explore possible personality characteristics as a motivation in the article “Using Adlerian Theory to Shed Light on Drug Dealer Motivations” (Applied Psychology in Criminal Justice, Vol. 5, Issue 2, pp. 109–138). The following table lists the types of drug sold from a sample of convicted drug dealers.

Drug sold Frequency Marijuana 73 Crack cocaine 62 Powder cocaine 45 Ecstasy 20 Methamphetamine 17 Heroin 5 Other 4