 Since 1964 conclusive medical evidence of the deadly effects of tobacco consumption has led to a sharp decline in official support for producers and manufacturers of tobacco, although it contributes to the agricultural, fiscal, manufacturing, and exporting sectors of the economy.Laws around the world now often have some restrictions on smoking, but almost 6 trillion cigarettes are still produced each year, representing over a 12% increase since the year 2000.China accounts for over 40% of current world production.