Again, I'll help a candidate by letting them know what type of interview to expect (whiteboard, grilling, pairing, etc.), but not specific questions. I'll also mention if there is a drug test, and I can't help them pass that either. I don't think anyone would consider that cheating, especially in this day and age where candidates can find actual interview questions and answers in a ton of places.

I'm sure other recruiters may be inclined to try and let their candidates cheat. My reputation is worth more than that, and since my work isn't contingency I don't have the same incentives to cheat as contingency recruiters do.