Cadmium is dangerous. If it is ingested it is very bad for you. The cadmium in the glass that is used in this industry is really fairly safe. When the glass is originally made it does a lot of off-gassing and the air is exhausted through a very well ventilated area. Once the glass is made the glass is fairly safe to work in the flame and is really pretty safe in the cool state. Even when a piece of boro cadmium glass is used in a banger it is pretty safe. The glass does not get hot enough to turn molten so the cadmium is still in the glass. Many of the new bangers that use a piece of cadmium glass in it have the boro cadmium sealed away from coming in contact with the outside air