Kidney functionality. Kidney failure can minimize the rate at which the body clears nicotine and cotinine. Snus does have nicotine, so it’s addictive -- you may get hooked on it. Quitting this habit has the exact same unpleasant Negative effects as after you stop smoking, including head aches and nausea. https://www.shutterstock.com/nb/g/Icyshop+es/about