With an aim to guide the youth and community leaders against the harmful effect of tobacco, the Centre for Adult, Continuing Education and Extension (CACEE), Panjab University, observed "No Tobacco Day', on Tuesday. Around 40 community leaders attended the programme. Programme in-charge Renu Gandhi said that to ensure good health, one must cultivate the habit of abstaining from tobacco. She expressed deep concern about the figures released by World Health Organisation, which stated that a hundred million people died in the 20th century because of tobacco.