I was just talking to someone offline and she said that I should be careful using "siddhis", and that they require a very "clean mind".
I don't think of what I do as a siddhi, but I want to hear everyone's thoughts.
I use rapport building and thought transference to help people with pain. For example, someone has tennis elbow, and I might transfer the thought "The elbow is healed".
If a person is happy about his elbow pain having disappeared after seeing me, where is the problem? I don't believe my skills are very strong at all, but I use what i have to make things work out in a pleasing way. The pain doesn't always disappear by the way - it seems to depend upon how much rapport the person allows and I can't/don't force that.
Also, how is this different from interpersonal attraction, wherein two people develop (or allow) rapport, and all sorts of images and thoughts get transferred between the two of them? I think thoughts are being beamed between people continuously. I do my best to keep thoughts positive or neutral.
This person I was chatting with seemed to become angry at me and left the conversation in a hurry, before I could ask her what she was thinking.

Up until that point, the conversation had been very amiable, as usual.