The entire course of history could have been altered by something as simple as a smoking habit, a new book has revealed.

For, the book claims, Barack Obama would never have run for president had he not received his wife Michelle's backing - and Michelle would not have given it had he not promised to quit smoking.

Being home on Sundays, attending parent-teacher meetings, and going to his daughter's music recitals were also part of the price tag that came with the chance to run for the most powerful job in the world.

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