There is laugh; and, there is laughter. Laugh is the verb; laughter is the noun. Although, it has been said that someone had a good laugh or got the last laugh; and, that laugh is a noun, not a verb. But, I laugh at all that and say that I better hold up on that line of thought before I confuse myself. Go over this-a-way for more on that line of thought.
It has been said that laughter is the best medicine. Don’t take my word for it. Read:
Laughter is the Best Medicine over at Helpguide.org.
Laughter: The Best Medicine over at Psychology Today.
Laughter Is The Best Medicine over at ScienceDaily.
Talin wrote a good entry on her blog, TALINORFALI. I suggest you go over to read I Love To Laugh.
Not only all that; but, Laughter as Therapy may be very beneficial.
Now, take that computer mouse or touch pad and head on over to The Quote Garden for Quotations about Laughter.