Can herpes or any other std spread by sharing a pipe? i smoked a bowl of weed with a kid and found out after he had herpes. should i be concerned?

Swapping saliva?: Any activity that can involve the exchange of saliva can potentially spread an std. Conditions have to be "right, " though. For example, the one person would have to have a lesion which is shedding the herpes virus, and the other person would have to have a portal of entry for the virus. I'm guessing your risk here is low, but couldn't say with certainty. Good luck.

Yes: Herpes can be spread by sharing a pipe, especially if the surface wasn't cleaned between exposures.