if you have an active herpes lesion and are smoking the cigarette butt could have live herpes virus on it. if a child or anyone for that matter puts this butt in their mouth the virus can be transmitted. not all exposure to herpes will result in disease so cross your fingers. last comment: hopefully you are not smoking around a child and leaving your cigarette butts where a child can get to them.
can a kid get herpes from a cigarette butt?