Is humour necessary in our lives?

In life, laughter is strong medicine for mind and body because it strengtheng our immune system and boost our energy.
First of all, laughing relaxes the body and makes you feel good and for this reason you forget the bad moments and be more positive or happy.
On the other hand, there are people who don't laugh, they haven't got sense of humour.
I recommend them to learnt to smile, watch anything funny or read anecdotes, you can be happier.
In conclusion, do this if you want a good life and good moments, don't be stressed, always smile.