I would say that as you are a virgin, this does sound like a false positive. HSV 2 is not 'too' often spread orally but when they talk about that, they normally mean through oral sex, giving or receiving. HSV 2 is a skin to skin std. Theoretically, sharing a blunt 'could' but is unlikely. Contact is usually necessary such as kissing, oral sex, intercourse, etc. https://www.plannedparenthood.org/learn/teens/ask-experts/can-herpes-be-spread-through-sharing-food-and-drinks The article is about food or drink, but sharing a blunt is the same type of thing. What does your doctor say? You had no sores or symptoms so what prompted the test?