This shows the estimated annual consumption of manufactured cigarettes per person since 1905. The time lag between men and women is clearly visible, as are the peaks associated with the First and Second World Wars. In men, consumption rose steadily until the mid-1940s, before decreasing and remaining steady for thirty years. Since the mid-1970s, cigarette smoking in men has seen a sharp decline. In women, the peak consumption occurred in the mid-1970s. Until the 1960s, the number of cigarettes smoked was a good estimator of the weight of tobacco smoked, but greater use of filter cigarettes has led to a decrease in total weight of tobacco smoked despite the number of cigarettes smoked remaining relatively stable.