One in four cigarettes smoked in Singapore last year was illegal, costing the Government millions of dollars in lost taxes and fuelling organised crime.  The Republic had the fourth-highest rate of illicit tobacco use in Asia, a regional study has shown. Smokers here consumed 900 million contraband cigarettes, depriving the state of around $347 million in tax revenue. Meanwhile, Interpol has warned that the illegal tobacco trade allows criminal gangs to flourish and could be used to fund terrorism.