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.
NOTE: "Canopy hoods" provide very little respiratory protection from inhalation hazards. They do not capture much except
Burns
Cuts
Mechanical Hazards -- glassblowers lathe, grinders...
Ergonomic injuries -- problems caused by posture/position and/or repetitive motions and/or stresses.
Links:
U. Washington School of Public Health