2 doctors weighed in:

Is it possible to contract aids, hiv, or STDs from smoking already used cigarettes off the street?

2 doctors weighed in
Dr. Gurmukh Singh
Pathology
1 doctor agrees

In brief: Low risk, but the

Practice of smoking discarded butts is a very bad idea.
You are exposing yourself to many infections, e.g., herpes, infectious mono, helicobacter, hpv and HIV etc. Not to mention the health risks of tobacco. Stop using tobacco in any form. See this site for HIV information. http://www.cdc.gov/hiv/resources/qa/transmission.htm.

In brief: Low risk, but the

Practice of smoking discarded butts is a very bad idea.
You are exposing yourself to many infections, e.g., herpes, infectious mono, helicobacter, hpv and HIV etc. Not to mention the health risks of tobacco. Stop using tobacco in any form. See this site for HIV information. http://www.cdc.gov/hiv/resources/qa/transmission.htm.
Dr. Gurmukh Singh
Dr. Gurmukh Singh
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