A study in the US has found that smoking increases the risk of breast cancer in older women by almost 20%.
The study adds to a growing weight of evidence linking exposure to tobacco smoke and deadly disease.
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The annual event has earned a place in the record books ahead of the grand final of the 60th anniversary show in Austria this evening.
Local authorities said the move is necessary to "avert the growing number of deaths and increasing harm linked to psychoactive substances".
Some students argued that the centuries-old tradition of wearing gowns, suits and mortarboards to exams was 'archaic' and looked elitist.