If I were to stereotype smokers I wouldn't call the a group of luxury item buyers. I know tobacco isn't a necessity but the anacedata point from me would be that poverty and tobacco use are closely correlated.
Luxury traditionally means "optional" in this context. People can generally live and work without tobacco. Industrialized countries currently require oil, although this is changing.
Industrialized countries will require oil for a long time yet but it does seem that it is in the process of losing its special status as a lynchpin commodity and turning into "just another commodity" like aluminum or iron ore.