How can I laugh more?

You shouldn't think so deep about everything that is said, instead, just be simple and go with the flow. Feel the energy when people are laughing around you and laugh with them! I don't advise smoking marijuana but if you smoked that maybe once or twice with good friends and reminisce about the funniest moments back in the day, it might bring that laugh spark back :D Hope this helps. And don't get hooked on marijuana!