A lot of it comes down to whether or not they find out about the lie. Even if the lie doesn't hurt them, being lied to still breaks the trust between the two parties. It makes them wonder if they're always being lied to. They question everything the other person says from then on, in case of deception by the other person. If they never find out, it's probably not bad, but if they do, then it's probably going to actually hurt them.
Then, there's the type of lie. If they're hyperbole, in order to spice up a story, then there's really no harm in it. However, if they're large exorbitant lies, with many specific things that require covering things up, then it causes the liar pain. They have to make sure that they are able to uphold the lie, and will likely be in a situation where they'll have to go to great lengths to hide the lie. Then there's the chance that they'll forget about it, and accidentally expose themselves via a slip of the tongue, and that causes the situation explained above.
If a person lies enough, then there comes a dissonance that comes with living a life made of lies. Not only do they have to keep them all straight and work to make sure they're never discovered, they have to deal with the realization that their whole life's a lie. Some people can manage it, but a lot end up eating themselves from the inside over that fact.
In the end, it's probably the best thing to do, so don't do it often - if you're thinking about doing a bunch of lying. Often times, telling the truth is easier, but lying is a fact of life. The key to lying is not being overly complex, nor overdoing it.
That's a really hard question to answer.
A lot of it comes down to whether or not they find out about the lie. Even if the lie doesn't hurt them, being lied to still breaks the trust between the two parties. It makes them wonder if they're always being lied to. They question everything the other person says from then on, in case of deception by the other person. If they never find out, it's probably not bad, but if they do, then it's probably going to actually hurt them.
Then, there's the type of lie. If they're hyperbole, in order to spice up a story, then there's really no harm in it. However, if they're large exorbitant lies, with many specific things that require covering things up, then it causes the liar pain. They have to make sure that they are able to uphold the lie, and will likely be in a situation where they'll have to go to great lengths to hide the lie. Then there's the chance that they'll forget about it, and accidentally expose themselves via a slip of the tongue, and that causes the situation explained above.
If a person lies enough, then there comes a dissonance that comes with living a life made of lies. Not only do they have to keep them all straight and work to make sure they're never discovered, they have to deal with the realization that their whole life's a lie. Some people can manage it, but a lot end up eating themselves from the inside over that fact.
In the end, it's probably the best thing to do, so don't do it often - if you're thinking about doing a bunch of lying. Often times, telling the truth is easier, but lying is a fact of life. The key to lying is not being overly complex, nor overdoing it.