Addictions: Sugar is said to worsen addictions in smokers and alcoholics. People who are addicted to tobacco and alcohol also have an inclination towards sugar and carb rich foods. Sugar releases the neurotransmitter called dopamine in the brain. This makes them crave addictive substances like cigarettes and drugs, which tends to have the same effect on the brain as sugar, i.e. it releases dopamine and enhances the mood. So if you are trying to beat an addiction, consider eliminating sugar from your diet.