A study by the International Tax and Investment Centre and Oxford Economics found that 900 million cigarettes were bought on the black market in Singapore. The amount of tax revenue lost to the government was estimated to be around $276 Million (347 Million Singaporean Dollars).
Based on the total amount of cigarettes smoked in Singapore, roughly one in four cigarettes smoked in 2012 was purchased on the black market.
Security agencies arrested 6,248 people for buying illegal cigarettes in 2012, an increase from the 5,977 arrested in 2011.
Source: Joyce Lim, “1 in 4 cigarettes in Singapore illegal,” Asian One, September 29, 2013.