I am sure honesty is still the best policy. Do you know why? Because happiness and honesty both are related, you can not enjoy happiness honestly if you are not honest. Honest happiness comes to honest people. The degree of happiness depends on the degree of honesty. The more you practice honesty you will get more honest happiness instead of fake laughing. Because people in today`s world are not interested in to true happiness rather they are interested in showing others that they are happy. Don`t try to show that you are happy rather than try to feel happiness and try to enjoy happiness.
This is one of best quote about happiness--
A happy person is not a person in a certain set of circumstances, but rather a person with a certain set of attitudes. -Hugh Downs
If you are still confused about honest happiness than I would give you an example. Have you ever seen a happy kid? If not, please see the above image that is true and honest happiness. Du you why this kid is feeling true and honest happiness? Simple because he is an honest and even he does not know the meaning of honesty.