Lil' Johnny at it again...

Little Johnny watched the science teacher start the experiment with the worms.
 
 Four worms were placed into four separate jars.
 
 The first worm was put into a jar of alcohol.
 
 The second worm was put into a jar of cigarette smoke.
 
 The third worm was put into a jar of sperm.
 
 The fourth worm was put into a jar of soil.
 
 After one day, these were the results:
 
 The first worm in alcohol - dead.
 
 Second worm in cigarette smoke - dead.
 
 Third worm in sperm - dead.
 
 Fourth worm in soil - alive.
 
 So the Science teacher asked the class - "What can you learn from
 this
 experiment."
 
 Little Johnny quickly raised his hand and said,
 
 "As long as you drink, smoke and have sex, you won't have worms."