What kills more people: smoking, or bad eating habits(obesity) and a bad lifestyle(lack of excersise)?

Definitely, all three are contributory factors to an early death. We are what we eat. .

Whatever we put in our system.esp too much sugars and carbs without proper exercise to burn the excess carbs and thus fats; will eventually risk the person to Obesity.and heart disease. Even if we eat a lot, if we exercise,or eat the right kind of foods; there is no reason to become obese. Obesity would eventually lead to hypertension, strokes; heart disease ;diabetes.and or cancer.

Smoking compromises the lung capacity. and can also contribute to lung cancer. MOrtality rates for cancer and heart disease are high.

So, in the light of an inevitable choice; I guess..... obesity is the winner.

i would have to say obesity
I think having bad eating habits and not exercising is worse, because unlike smoking it can affect way more things than just your lungs: heart disease, high blood pressure, high cholesterol, type 2 diabetes, ect.
http://www.kidshealth.org/teen/food_fitn...