Always check the composition of materials before using them in the laser cutter.

MSDSs can be a good source of information about the decomposition hazards of materials.

Check for hazards to firefighters or hazardous products of decomposition.

The MSDS shown here is only an example (this is the MSDS for PVC pipe), you may have to do some sleuthing to find the information you're looking for.

When in doubt about any material, post a message on https://talk.lansingmakersnetwork.org asking for help!