I have a general question regarding safer snorting.
On the internet it is always mentioned that straws should not be shared. However it is common practice that people use the same surface (e.g. phone screens, plates etc.).
Is there any risk of HIV transmission, assuming that small amounts of blood could have ended up on the surface, for example because someone infected touches the surface with the straw that previously was in the nose, and someone else snorts it up his nose through the own straw from the surface?