Don’t cut vinyl sheets, pvc, or “contact paper”. These materials emit chlorine gas (among other things) and will harm you, your laser’s lens and many other things. ALWAYS look up the msds for materials you plan on cutting–just because the device has an air filter, doesn’t mean you should cut everything with it. Another example of a material you may not want to cut is plywood. Many people cut plywood, and this is fine, but the glue contains–and emits–formaldehyde. I’ve also found it doesn’t cut that well, since the glue tends to melt and refract the laser. Better you use solid hardwood boards like poplar as these are not hard to find at big box stores.
Anyway, sorry about the long-winded answer… In summary, you can cut certain label sheets out, you should NEVER cut vinyl just be very careful and look up what you are cutting before you do!