This D3.js bubble chart visualizes the relationship between reported alcohol and tobacco use across U.S. states, with data sourced from the CORGIS dataset. Circle position maps total alcohol use against total tobacco use, while circle size encodes population and color intensity represents the rate of alcohol use per 1000 people. The chart uses `d3.scaleLinear` for axes, size, and color, and renders SVG circles with hover tooltips via `<title>` elements. It includes labeled x and y axes, a chart title, and a legend explaining size encoding.