L'un des rapports les plus importants est celui du ratio goudron/nicotine, c'est-à-dire le ratio entre les éléments débilitants, soit le goudron, et les éléments satisfaisants, soit la drogue.
One of the most important of these is the tar/nicotine ratio, which can be regarded as the ratio between the compounds related to disease, that is compounds found in tar, and the drug, which is related to satisfaction.