Smile is a beautiful expression. It is very common thing while people laugh on jokes and comedy talks, however smile is not a common thing and easily available for everyone.
When we laugh ? Any idea ? No.
Let me tell you. We laugh when we are happy right ? The answer is No. we laugh when we knows the meaning of smile, Smile gives us laugh but only few people knows that smile can help to become happy.
People thinks that they knows how to smile and they just laugh.. but its not true smile is not just a expression its a feeling of happiness. when people are happy from inside they will smile. if people are not happy still they are smiling then its painful situation for them. So smile can make you happy if you are happy.
People may smile if they have achieved something... People may smile if they are in LOVE. People may smile if everything is good in their life. People may smile if they win, People may smile if they see someone is smiling..
Smile makes you happy, Happiness gives you smile. both are related with each other.