For me luck is happiness.
When you are lucky you can have and get what you want in life, and when you get what you want in life you are happy.
So I like to think that luck = happiness
Because under luck can go stuff like
Finding love
Getting a job you like
Have normal living conditions
So many people don't have these things and are not even possible to acquire for them.
So if you have these 3 things in your life. You are lucky.
and probably happy aswell.
Is or Causes happiness?
Causation is not the same as Correlation.