This latest edition continues the celebration of molecules responsible for the experiences of everyday life such as the air we breathe, the water we drink, the chemicals that fuel our living. It presents new sections, notably the chemistry of molecules in food, including spices; vitamins; molecules with unpleasant smells (which seem to interest many people!); organic halogen compounds, substances which have an undeserved reputation. It also covers developments such as the chemistry of drugs; drugs of abuse, for example opioid painkillers. Based on the highly successful first edition, this book brushes away any preconceived notions about chemistry to demonstrate its importance.