I've been smoking for around a year now and for the past few days I've!

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You deserve it for smoking. See your doctor before you end up six feet under and consider quitting if you want to live. Treat your body well.

ummm sorry to say you brought it upon yourself ...everyone knows how bad smoking is yet you continue to do it ....

You should quit.... by the way talk to any of your Muslim friends in help with that .... I know Muslims have this month fasting ( called Ramadan) many Muslims ( who were smokers) fast all day and in the evening reduce their smoke a few every day and after one month of fasting they were able to quit ..

You do not have to be a Muslim to practice fasting -- it is best way to quit --talk to a Muslim person you know ..
best of luck !

You don't need anyone to tell you that you shouldn't be smoking at all. And yes, you should go see a doctor.

The pain is caused by tight muscles in your back. When you are inhaling you are moving your spine back and tightening up the muscles to bring out the pain. When you were walking the bounce of the walk caused your frame to move enough to get the muscle pinched by the spine again. To get rid of the pains you have to free up your back muscles so they quit getting pinched and here's how to free them up:
Back:
(do from a sitting position)
Place your left hand on your left leg next to your body. Place your right hand over your left shoulder, fingers over the back and the palm in the front and firmly pull down on them and hold. After 30 seconds slowly lower your body forward and to the outside of your left leg, keeping your left arm fairly straight as you do. When you reach your lap remain there for another 10 seconds, release the pressure but rest there for another 30 seconds. Then reverse your hand positions and do your right side.
For best results relax your body first by taking a deep breath and exhaling then remain this relaxed.