Oh yes, they def do help.
Here are some other things you can do;
Work the entire area of the thigh when working out. Work the inner, side, front, back and buttocks. Exercises such as the bicycle, leg lifts, leg slides, squeezing a stability ball and leg raises help slim the thighs.
Reduce the amounts of carbohydrates and fats in your diet. If you notice that your thighs store fat, then any excess fat from food and drink will go straight to your thighs. Drink more water, eat more fruits and vegetables, drink skim milk, low fat dressings and fat free cream cheese and other cream based products.
Begin a walking routine. Walking helps slim down the body overall and won't bulk up your leg muscles like jogging will.