Lighting cable "not original" - will it harm iPhone?

Hello

Stupid me *yes*

Got an additonal ligiting cable for IP5 for charging at work.

Did not notice that it was at all not an original Apple product...bad on me.

So, I have noticed that when I plug into phone, and try to work with phone..."touching" is like "freezed" or "slowmotioned"...or even when i touch lower level of icons, it "recognizes" the icon 3 rows above.....

This is one and only cause i get, rest is oki, I mean cable does it work - charding...

Can these dodgy cables harm the phone at some point?

What do you say...