There's a gene for detecting that fishy smell, olfactory GWAS shows

Some people carry a mutation in a particular gene that makes the smell of fish less intense. The study, which is the largest genome-wide association study (GWAS) of olfactory genes in humans involving a sniff test and looked at over 9,000 people from Iceland, also shows that people vary in their ability to discern the smell of licorice and cinnamon.