Try to set a new routine, such as working out or going to the gym. If that isn't possible, you should try waking up earlier and going for a short walk. If you can turn that walk into a run or a jog, it is going to be very stimulating and the best way that you can start your day.
Keep in mind that exercise doesn't necessarily mean pumping iron. If you don't have the time to stop by the gym every day, then it isn't really that big of a problem, as you can always choose to work out at home.
Whether you choose to workout at home or at a gym, you should always remember that regularity is the key. It isn't getting started that's the difficult part, it's sticking to a regular exercise program that is difficult and proves to be stumbling block for most people.
Some people have a great start. They will buy track suits, gym wear, running shoes, and a lot of other gear, so their first day at the gym is almost like a celebration. As the days go by, they find it very difficult to meet the demands and their routine will slow down a lot and finally come to a complete exercise burnout.
One mistake that several people make is choosing the evenings to exercise. If evenings fit your lifestyle, then it's fine. For most people, however, the evening hours are when they are completely pooped. By the evening most of us are drained, and simply too tired for exercise. Therefore, it is always best to set some time aside for exercise in the morning.
In the morning, wake up a half an hour or so earlier, put on your shoes, and hit the road. Most roads are less crowded in the morning and less polluted as well, making it a wonderful and relaxing way to start the day.
One of the unintended "benefits" of quitting smoking with exercise is that you will come face to face with how much lung capacity you've lost from smoking, especially if you attempt to jog or swim. However, that shouldn't make you quit. It should motivate to keep going and get it back, which you can. How much depends on how long you've been smoking, but no matter how long you've smoked, the day you stop is the day you stop doing damage to yourself.