They should have let her smoke on set. While I don’t condone smoking, it would have been totally on-point for her character and would have tied in well to the coffee addiction. Her mannerisms just fit with her being a smoker. (Back then, smoking was still kinda socially acceptable.)

If someone didn’t know, Kate Mulgrew was a heavy smoker back then but quit during the filming of Scientific Method. The pain was actually real.