What is the main reason that restaurants, offices, and other public places have separate areas for smokers?

Because it is called second hand smoke, when non smokers get affected by smoke, and it can be extremely dangerous, even deadly

Animals will lose energy because it is converted to heat

If it's a smaller child or infant, place one on the middle of the chest and on the child's back. (if it is a bigger child with enough room for two, place one on the upper right/your left of the chest, and one on the lower left/your right) the pads should never touch each other.