emitting, producing, or having little or no smoke.

1575–80; smoke + -less

smokelessly, adverb
smokelessness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To smokeless
World English Dictionary
smokeless (ˈsməʊklɪs)
having or producing little or no smoke: smokeless fuel

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The difference between smoking and smokeless engines is crucial to the pilots
  but virtually undetectable by the untrained eye.
Smokeless tobacco products allow tobacco to be absorbed by the digestive system
  or through mucous membranes.
Magazine readers no longer have to squint to see the health warning on ads for
  smokeless tobacco products.
Seeing past smokeless tobacco advertising and promotion.
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