This scatterplot visualizes the relationship between total reported alcohol and tobacco use across U.S. states, where each bubble’s size represents the population of adults aged 26 and older. The color intensity reflects the rate of alcohol use per 1,000 people, with tooltips providing exact values. Built with D3 v7, the chart uses `d3.scaleLinear` for position, radius, and color encoding, along with `d3.axisBottom` and `d3.axisLeft` for axes. Data comes from a CSV hosted on GitHub, rendered as SVG circles over linear-scaled axes with custom legends.