When causes of death turn out to be vice-related, the dangers of said vices are clearly explained.
No actual autopsies or body parts are shown on screen -- corpses are portrayed by actors. Occasional stock photos of organs are used for explanations or diagrams. Dr. G usually has real blood all over her apron. Other footage shows blood being rinsed off equipment, etc.
Drinking, Drugs & Smoking
Alcohol and other drugs can be the cause of death in some patients. Neither are presented in any kind of glamorous light.