Here is an article from Clinical Infectious Diseases on the attributable mortality of smoking in HIV positive patients.
A total of 2921 HIV patients and 10,642 controls were followed for 14 281 and 45 122 person-years, respectively. All-cause and non-AIDS-related mortality was substantially increased among smoking compared to nonsmoking HIV patients. A 35-year-old HIV patient had a median life expectancy of 62.6 years (95% CI, 59.9-64.6) for smokers and 78.4 years (95% CI, 70.8-84.0) for nonsmokers; the numbers of life-years lost in association with smoking and HIV were 12.3 (95% CI, 8.1-16.4) and 5.1 (95% CI, 1.6-8.5). The population-attributable risk of death associated with smoking was 61.5% among HIV patients and 34.2% among controls.
Even when HIV care is well organized and antiretroviral therapy is free and accessible, HIV-infected smokers lose more life-years to smoking than to HIV.
The bottom line: among HIV infected smokers the rate of non-AIDS related death was raised >5 fold and the majority of these deaths were from cardiovascular (heart) disease and cancers.
If you are concerned about your health, quit smoking.