smile and laugh

hi i think these examples gives you a clear idea - we smile when we meat a person or while wishing him - they laugh at looking a stout girl out side wearing a middy.

There difference between these two are: smiling has no sounds, it can be mean that you like the person, a way of letting them know that you are nice and approachable while laughing has loud voice coming out in your mouth and the gums, teeth and tonsils are visible and sometimes it can be mean rude when you laugh (unentintionally) looking to the person that you didnt know. Could be start of trouble, careful when you laugh be sure that you look at yourself not to others!