The crossword solution for the term 'cigarette substances' is TARS, which stands for Tar, Ash, Resin, and Smoke. Tar is a dark, viscous liquid that is produced when tobacco is burned. Ash is the solid residue left after combustion. Resin is a sticky, yellowish-brown substance that is produced when tobacco is heated. Smoke is the gaseous byproduct of burning tobacco. All of these substances are found in cigarettes and are known to be harmful to human health.