Annual consumption of tobacco items (e.g. cigarettes, cigars) in grams per person aged 15 years or more. The methodology used to convert tobacco items into grams may differ across countries. Typically, a cigarette weighs approximately 1 gram, of which the tobacco content can vary between 65 and 100%, depending on the type of cigarette; a cigar weighs approximately 2 grams and contains a similar proportion of tobacco to a cigarette. In 2009, 22% of the population older than 15 years within the OECD countries were smokers, 18% less than a decade ago. The rates were lowest in Mexico, Sweden, Iceland, the United States, Canada and Australia; on the other hand, Greece maintains the highest level of daily smoking, at 40% of the adult population, along with Chile and Ireland, with around 30%.