I really like the idea behind this poem and it shows what impact something as simple as a laughter may have on people around you. That's why I prefer to always smile and laugh, which obviously doesn't always work but I try at least.

But back to the poem: I'd recommend you to remove the dots at the end of every second verse, they are not necessary and have something depressing to them, in my opinion.
I like your choice of words, rhyme and flow though it could be even better.

Overall I think this poem definately has potential and is a great start.

Welcome on PnQ!