"Smoking of crack cocaine was found to be an independent risk factor for HIV seroconversion among people who were injection drug users. This finding points to the urgent need for evidence-based public health initiatives targeted at people who smoke crack cocaine. Innovative interventions that have the potential to reduce HIV transmission in this population, including the distribution of safer crack kits and medically supervised inhalation rooms, need to be evaluated."

Source

Kora DeBeck, Thomas Kerr, Kathy Li, Benedikt Fischer, Jane Buxton, Julio Montaner, and Evan Wood, "Smoking of crack cocaine as a risk factor for HIV infection among people who use injection drugs," Canadian Medical Association Journal, (October 2009), 181(9), p. 588.