- Posts: 39
- Thank you received: 4
A new study reveals that the residue of nicotine that lingers on surfaces can react with another chemical in the air to form potent carcinogens — chemicals linked to various cancers. While first-hand smoke is that inhaled directly by the smoker and second-hand is the smoke exhaled (and inhaled by others), third-hand smoke is the residue from second-hand smoke.