If you don't quite smoking, the two things you learn first hand include the inability to run as fast as you used to and the increased risk of lung cancer. Both of these take a heavy toll on your body. Try keeping sentences short so they are easy to read and understand. Otherwise most readers/listeners will get lost if there is too many elements in a sentence to track (the sentence could be perfectly correct but difficult to understand). Hope this helps. Alex

Thank you so much for your help!!

If you don't quit smoking, two things might happen to your body. The first one would be the inability to run as fast as you used too and the second one would be the increased risk of developing lung cancer. You did a good job btw. It just needed a few adjustments. If you need tips on how to improve your english don’t hesitate to contact me :)

If you don't quit smoking, two things will take a heavy toll on your body. First, you will barely able to run as fast as you used too. Second, the risk of lung cancer will increase significantly.