Hi, Im asking for someone, they had 2 juuls (ecig ) sitting in a box and they found a bloody tissue sitting on top of it do they need to be worried blood got into them and now can’t use it?

ב"ה Shalom If there is a reason for us to be concerned from the Kosher point of view, it would only be if the blood was absorbed into something which a person would benefit from. I don't see how an old bloody tissue could allow blood to enter the juuls which are in protective covers. All the best