Definition: In this task, you're given a short article. Your job is to classify the article based on its category. Use the following classification labels, 0. World, 1. Sports, 2. Business, 3. Science or Technical. Label the text "0" if it contains information related to world. Label the text "1" if it contains information related to sports. Label the text "2" if it contains information related business. Label the text "3" if it contains science or technical related information. 
Input: Passive smoking risk  #39;kept secret #39; A LAB owned by US tobacco giant Philip Morris uncovered evidence in the early 1980s about potential risks from passive smoking but its findings were never made public, a new study charges.
