The drip enters your stomach and irritates your esophagus to cause hiccups
Proctor (December 1996), "The anti-tobacco campaign of the Nazis: a little known aspect of public health in Germany, 193345", British Medical Journal , 313 (7070): 14501453, doi:10.1136/bmj.313.7070.1450, PMC 2352989, PMID 8973234 "Research on Smoking and Lung Cancer: A Landmark in the History of Chronic Disease Epidemiology"
Zendehdel K, Nyrn O, Luo J, Dickman PW, Boffetta P, Englund A, et al
Item Number : P12434
Smokers also face increased risks of heart disease, stroke, asthma, diabetes, and at least 10 other kinds of cancer