Funny you should say that, because St Padre Pio strongly advised against using things that had belonged to a dead person. What I read specifically dealt with wearing clothes from a deceased person, but I strongly believe that anything used long and regularly by someone gets imbued with his essence to a lesser or greater degree. Ever put on something that belonged to a departed one and felt depressed that day? Well, something to do with the garment, chances high.
The context and the things items are used for also matter. And with used stuff most times we simply have no idea not only how well they were taken care of (which impacts the more mundane issue of durability and hidden damage), but where they've been and what things were done with them. Who in his right mind and spirit would want to smoke from a pipe somebody else used to smoke whilst reading from a grimoire? Why would I want to use a leather knife that some pervious leatherworker used to make sexual bondage paraphernalia? &c., &c.
Even when I get brand new tools I spray them with holy water.