We all know the ill effects smoking or chewing tobacco has on our health but dying of cancer is not the only thing you need to worry about if you are a smoker that is. A new study has found that people who use tobacco face are more vulnerable to the sexually transmitted infection oral human papillomavirus type 16 (HPV-16). Oral HPV-16 is believed to be responsible for the increase in incidence of oropharyngeal squamous cell cancers in the United States. An association between self-reported number of cigarettes currently smoked per day and oral HPV prevalence has been observed according