Good health apparently keys off at least these different developments: Genetic programming; Environmental factors; Lifestyle. This book is devoted to the effects of lifestyle on health. Lifestyle includes a wide range of activities that can be detrimental to a normal lifespan or health status of the organism. These include smoking, diet, addictions, exercise or the lack thereof, stress, socio-economic status, and personal hygiene. This book gathers leading-edge research from scientists throughout the world.