yes, definitely; you will feel energetic after you stop smoking. you might have some difficulties in the initial period but it will help your health.
Cigarette smoke contains carbon monoxide, a poisonous gas. Carbon dioxide cuts down on your oxygen supply, leaving you feeling run down and short of breath. When you stop smoking, your airway condition begins to improve. You will breathe easier and be less susceptible to infections. Also your senses of smell and taste will improve.