How to draw the infinity symbol with this smoothness

[Poto]

I'd like to know how to draw these smooth lines, especially the tapering of the line at the bottom of the center

If you draw it with a pen, it will be abrupt at the nodes.

 

The image below was drawn by me, but when you zoom in you will feel the rawness of the intersections

The lines don't flow as naturally as in the above picture.

Edited December 21, 2023 by Poto
edit

[thomaso]

It is possible with a gradient bitmap used for an image brush.

[GarryP]

Some related threads:

 

[lphilpot]

9 hours ago, Poto said:

when you zoom in you will feel the rawness of the intersections

The lines don't flow as naturally as in the above picture.

Just looking casually, the first one isn't made from two circles, but rather slightly flattened ellipses (would that be oblate ellipsoids?), actually teardrop shapes. That eases the transition between the straighter connectors and the more circular lobes. But neither are perfectly straight nor perfectly circular.