Exercise the Pectorals
Reinforcing the pectorals around the breasts can help reduce the sagging process. The muscles around the breasts can be strengthened with exercises such as plank push-ups.
Smoking accelerates the weakening of collagen and ligaments apart from causing damage to skin, cardiovascular system and lungs. Quitting smoking will not just help one to enhance their overall health but will also keep the tissues around the breasts from giving away early.
H/T : positivemed