Actually that's not a silly question at all.* Most newspaper print is made with veggie or soy based dies.* Glossy printed pages of magazines and catalogs can contain heavy metals and aren't the best to use this way. Some are made without the glossy dies and those would be fine.* Got any neighbors who subscribe?* How about plunking down $2.00 for the Sunday paper?
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.