You spot a fake laugh instantly in someone else and miss it in yourself.

You hear other people from the outside, where the seams show, and you hear yourself from the inside, where your reasons are. So the forced laugh, the agreeable voice and the enthusiasm you do not feel all sound fine from where you are sitting. It is not really dishonesty. You simply have no outside view of yourself to check against.

Notice the moments this week when your laugh arrives half a second late, because that delay is usually the tell. You do not have to stop doing it, because some social smoothing is kindness. Just notice which rooms require it, because that tells you something about those rooms.