do cigarettes calm your nerves Researchers find why nicotine in may relieve anxiety in smokers The Link Between Smoking Cessation

D'Elia L, De Palma D, Rossi G, Strazzullo V, Russo O, Iacone R, Fazio V, Strazzullo P, Galletti F

Sugar-free gum often contains artificial sweeteners that can also affect blood sugar

Alimentary Pharmacology & Therapeutics , 51 (12), 12681285

I have an old mountaineering guide that gives climbers the advice that they should take a pause every now and then during the climb so that they can smoke a cigarette as it opens up the lungs. The reality that smoking causes cancer and heart disease became only visible through careful statistical analysis

In addition, BMI, age, alcohol consumption and ethnicity might be more useful