The device, which is about the size of a cigarette lighter, plugs into iPhones, iPads, Android phones and tablets and BlackBerrys.

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An oblong crystal the size of a cigarette packet was next to a pair of dividers - suggesting it was part of the navigational equipment.

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These drives are based on flash memory - which stores data even after its device is turned off - and are about the size of a large cigarette lighter.

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About the same size as fine particles of cigarette smoke, the grains are made of silicate minerals and carbon-based materials coated with ice - principally water ice and frozen carbon monoxide.

BBC: University of Nottingham

At the ministerial meeting in May it is expected to seek the right to opt out of any clauses that it finds unacceptable, such as the ones imposing an advertising ban and a minimum size for health warnings on cigarette packs.

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The average clot size of those who smoked a cigarette in the six hours before their heart attack was 23 square millimetres.

BBC: Smoking

And for those who had not smoked a cigarette within 24 hours of their attack, the average size was just 6.7 square millimetres.

BBC: Smoking

In those who had smoked a cigarette between six and 24 hours before their attack the average clot size was 12.5 square millimetres.

BBC: Smoking