More Awesome Than You!

I currently have a sim who is using the voodoo doll to fulfill the simultaneous loves/woohoos wants. That's a lot of head-spinning action. I heard a rumor that overuse of the voodoo doll, like overuse of the wishing well, can have bad repercussions. Has anyone seen this yet? Not that her making all the men she meets her little woohoo puppets doesn't amuse me, but I'd like to keep her around for a bit.

In my experience, it just backfires the curse.  So say if you make someone cold, it'll back fire and make you cold.
Not sure about the love, friendship thing. 

Backfired friendship just made my sim a little cold, and gave him a bad memory. In fact, those memories pile up. I don't really like that.

The Bad Voodoo spam is mildly annoying, particularly since failed voodoo doesn't really have severe consequences if you're in good shape.

Isn't is just a timed thing?  Wait a few hours and it's perfectly safe again?  I notice the lot debugger has a reset voodoo uses thingy.
The only time I've had it backfire was then I tried using it on the voodoo priest.  He wasn't happy.

Not a clue. It shows you how many uses would be reset, so you can just not touch that button and see if it ever does.

I've done it and it seems to be a timed thing : roughly each use of the Voodoo Doll takes 24 hours (I did not look exactly, let say between 24 and 36 hours) to disappear. From limited testing I'd say :
-no uses : No backfire
-a few uses : little chance of backfire
-more uses (3+) : more chances of backfire
Someone who can look in the code could tell exactly how it works....

Voodoo doll success table is as follows:
95
85
75
40
30
20
15
12
9
6
3

Good to know. So far, she's never used it more than twice in a day. It could be amusing to let it backfire on her eventually...just as all this woohoo's going to catch up to her and those risky woohoo odds will knock her up.

is it possible to have a hack that eliminates the voodoo doll backfire memory?

Clear Trash will automatically wipe all but the first one.