chewing tobacco side effects The Dangers of Smokeless What is Dipping? The Health

Animal models have also demonstrated that PNE alters the development of the mesocorticolimbic system which is important for goal-directed behavior and its ability to modulate neural processes that contribute to drug abuse [166]

Some of that is attributed to not having something in their hand, boredom and increased appetite (nicotine can act as an appetite suppressant)

Atlanta, GA: US Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health

This leads to a decrease in coughing and sinus congestion