LC	Lung cancer
WHO	World Health Organization
VOC	Volatile organic molecules
GC-MS	Gas chromatography–mass spectrometry
e-nose	Electronic noses
QCM	Quartz crystal microbalance
MOS	Metal oxide semiconductor
TUBITAK	The Scientific and Technological Research Council of Turkey
FL	Fuzzy logic
AJCC	American Joint Committee on Cancer
LDA	Linear discriminant analysis
HnS	Healthy non-smokers
HS	Healthy smoker
DT	Decision tree
RF	Random forest
PCA	Principal component analysis
k-NN	k-nearest neighbor
SVM	Support vector machine
GA	Genetic algorithm
PSO	Particle swarm optimization
SA	Simulated annealing
IWO	Invasive weed optimization
AEO	Artificial ecosystem-based optimization