Regarding the graphic Road to Addiction (Feb. 9, A14): Tobacco is the No. 1 gateway drug to heroin and other highly addictive drugs. Why did the chart leave off the biggest killer of Americans by far? Had the bar graph included nicotine products, The Bee would have had to put the graph on the left margin of the back page to accommodate the length of the bar it would have needed. Why did the artist use this disingenuous ploy to attempt to show that marijuana is the most common first-used drug on the way to heroin and other addictions? Thats like leaving out sugary foods as a gateway food leading to obesity.