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Bangladesh outlawed smoking in public places in 2013. However, our survey of primary school children in the capital, Dhaka, found that 95 per cent had recently been exposed to secondhand smoke.

Secondhand tobacco smoke contains more than 7,000 chemicals, 70 of which can cause cancer. Children are particularly vulnerable to the harms caused by this smoke, as their lungs are still developing and they breathe at a faster rate than adults.