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Tar
- Heroin (National Library of Medicine)... or a black sticky substance known as black tar heroin. How do people use heroin? People inject, ...
- Lung Cancer (National Library of Medicine)... to asbestos, arsenic, chromium, beryllium, nickel, soot, or tar in the workplace Being exposed to radiation, such ...
- Smoking and Youth (National Library of Medicine)... cigars are not safe alternatives to cigarettes. Low-tar and additive-free tobacco products are not safe ...