Hiccups in ur case may be caused by a simple gastritis, or a gastroparesis
(delayed emptying of stomach) caused by diabetes. If ur father has liver and kidney problems, I want to know the values of bilirubin and urea, creatinine
Till then he may try metaclopramide tablets thrice daily along with pantoprazole
twice daily for a week. Or he may try chlorpromazine
tablets under ur doctor's supervision. There r various methods to stimulate vagus nerve
and stop hiccups.
Encourage him that he can be without smoking and boost up his confidence to stop it. Tell him some success stories. Then u can go for nicotine gums or lozenges to replace cigarettes