<em>Using smokeless tobacco, chewing tobacco and snuff can put one at greater risk of;</em>
Emphysema
Lung cancer
Mouth cancer
No, oatmeal is full of fiber which helps your digestive system and is mostly nutritionally beneficial, therefore it does not have empty calories.
I'm going to go with Yoga. This is because yoga requires stretching, and that's the entire basis of making your body become and stay flexible. Hope this helps!