This area chart visualizes the average population density of female smokers among COVID-19 patients by age. The chart uses a blue filled area beneath a black smoothed line, with axes labeled for female smokers and population density. Built with D3 v5, it employs `d3.scaleTime`, `d3.scaleLinear`, `d3.area`, and `d3.line` with `curveBasis` for smoothing. Data is loaded from a CSV file using `d3.csv`, and the SVG rendering includes custom tick styling and axis labels.