Everybody defines happiness, in a different way. The main point is usually the same but the little differences in each opinion make the wide variety of definitions. For example the happiness created by an externally consumed material is different from the happiness which friends can make you or experiences from years ago. Whereas drugs can give you a happy feeling for around a few hours, real happiness created by your friends can keep you happy for days. Don’t you feel happy if you think back in time when you played with your friends, or one of your old birthday parties.

But what is happiness actually? Furthermore can you really know what happiness is if you have never experienced other emotions like sadness or fear. In my opinion you can not know if you never experienced those, otherwise happiness could just be “not being sad” or it could be being curious or any other emotion.

I probably can not give a definition with which everybody fully agrees with but I think I can say that happiness is experienced by people the same way. The best way to achieve happiness is by remembering the past or by doing things with your friends, I know there is no real happiness created by taking drugs. This would be a fake happiness since it is not created by our surrounding and you later will not be able to remember the good times you had, which will lead to further happiness.
Moreover, I think people who only experience external happiness, caused by chemicals like drugs, will not be able to tell the difference between the real happiness and the fake happiness.