There are hazards associated with glassblowing and other glassworking activities involving heated glass. They are not all "common sense."
Inhalation hazards -- chemicals (unclean glassware), quartz fumes, asbestos (do not use asbestos tapes, etc.), some minerals used to color glass are toxic.
Mechanical Hazards -- glassblowers lathe, grinders...
Ergonomic injuries --
problems caused by posture/position and/or repetitive motions and/or