Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Thomas smoked 2 or 3 packs of cigarettes per day. After a few years, Thomas started to get sick. His doctor told him that if he didn't stop, he would die. Thomas wouldn't stop smoking. Thomas got COPD and died in a few years.
 selected sentence: Thomas smoked 2 or 3 packs of cigarettes per day.

Thomas smoked cigarettes from an early age >Causes/Enables> Thomas smokes two to three packs of cigarettes a day 