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On top of that, Hu, a biochemistry major, is studying for final exams next week.

Research on the ISS has shown that the biochemistry of astronauts' bodies changes during long duration space missions: their hormone balance and iron levels alter, and they we lose calcium from their bones.

"In this research, we used genetic, biochemistry and medical questionnaire data on more than 500,000 individuals making it one of the biggest studies reported on the effects of maternal smoking during pregnancy."

“Your genetics actually plays a role in this increased risk of developing future heart attacks and stroke,” said James Hilser, a Keck doctoral candidate in biochemistry and molecular medicine who helped write the paper.

Jane Perry said her son Owen was excited to start his biochemistry degree and move from their family home in Norwich - but now he is "disappointed and upset".