in Tableau I would like to figure out how to combine the y-axes for Former smoker, Never smoked, Smoke everyday, and Smoke some days. I want one y axis that ranges from 0.00 to 1. I appreciate any help, thanks.
Not sure your ideal graph output, but instead of plotting each individual measure. Drag the [Measure Values] pill to the y axis and filter for the measures you want. You can then drag [Measure Names] to the color shelf to make a line for each measure.
来源：https://stackoverflow.com/questions/46693583/how-to-combine-the-different-y-axes-into-one-y-axis-in-tableau