The gas phase of fresh tobacco smoke was injected onto an open-tubular gas chromatography column at low temperature. Mass spectra and retention data for components eluted on temperature programming suggest the presence of six new compounds: 1,1-, 1,2-cis-, and 1,2-trans- dimethylcyclopropanes; 1-chloro-5-methylhexane; 1,3,5-hexatriene; and 2-methyl-1-octene