1. producing no smoke or very little smoke
2. prohibiting or free from smoking tobacco

Examples

• The new smokeless coal burns much cleaner than regular coal.
• Smokeless powder was a major advancement in firearms technology.
• The restaurant has a smokeless policy throughout the building.
• We stayed in a smokeless hotel room during our vacation.
• The smokeless fireplace uses electric heating elements.
• Many cities have designated smokeless zones to reduce air pollution.
• The smokeless tobacco products are still harmful to health.