HICCUPS & Cannabis studies
Overview
There are numerous home remedies to get rid of hiccups, including holding your breath, drinking a glass of water quickly, having someone frighten or surprise you, using smelling salts, pulling hard on your tongue, and others.
For severe or chronic hiccups that are not cured with home treatment, medical treatments include medications, anesthesia to block the phrenic nerve, and surgical implantation of an electronic stimulator to the vagus nerve. Surgery to disable the phrenic nerve is a treatment of last resort.
The prognosis for hiccups is good. For most people, hiccups usually stop by themselves with no lingering effects. If hiccups continue, they may cause social embarrassment and distress, and chronic hiccups may result in speech, eating, and sleeping disorders.

Science & Research
Undated - Anecdotal - Hiccups by Ben.
2012 - News/ Anecdotal - Teen Says Marijuana Has Been a Lifesaver
2004 - Study - Cannabinoids Suppress Synaptic Input to Neurones of the Rat Dorsal Motor Nucleus of the Vagus Nerve
1998 - Study - Marijuana For Intractable Hiccups
1998 - News - Marijuana Cures Hiccups