Why can't some people smell certain plants?

Question of the Week, from the Naked Scientists

Tim wanted to know "Why can't my partner smell certain strong odours when in the countryside? She can smell manure but is immune to smelling certain potent flowers and herbs." Otis Kingsman spoke to Professor Sandeep Roberta Datta from Harvard Medical School to find the aromatic answers to this question... Like this podcast? Please help us by supporting the Naked Scientists