Botox, which I have been injecting for aesthetic purposes since 1991, is used for, among things, calming the overactive facial expression musculature responsible for the production of scowl lines between the eyebrows; crow's feet lines to the sides of the eyes; forehead worry lines; and droopy marionette line angles to the sides of the mouth. It is definitely not used in the cheeks the way you describe, since doing so would likely adversely affect the ability to smile. A a robust filler, such as Restylane Lyft or Voluma XC, placed appropriately in the cheekbone regions can, however, provide the kind of lift and projection that can not only improve overall facial contour, but diminish the smile lines below. Make sure to consult with a board certified aesthetic physician and ask to see his/her personal before and after photos before agreeing to proceed. Best of luck.