PúblicHealth IN THE 406 MONTANA TOBACCO USE PREVENTION PROGRAM Secondhand and thirdhand smoke doesn't just harm you. Pets exposed to smoke and its residue may develop allergies, respiratory infections, heart problems, or cancer. Make your home smokefree and help your family and pets live longer, healthier lives. PúblicHealth IN THE 406 MONTANA TOBACCO USE PREVENTION PROGRAM Secondhand and thirdhand smoke doesn't just harm you. Pets exposed to smoke and its residue may develop allergies, respiratory infections, heart problems, or cancer. Make your home smokefree and help your family and pets live longer, healthier lives.