This may be an urgan legend. See:
http://www.netwellness.org/question.cfm/20682.htm

Nenah

  ----- Original Message ----- 
  From: [email protected] 
  To: [email protected] 
  Sent: Wednesday, November 29, 2006 9:52 AM
  Subject: Re: CS>Tongue cancer Never Lick Envelopes



    NEVER LICK ENVELOPES 

    A woman was working in a post office in California. 
     
    One day she licked the envelopes and postage stamps instead of using a 
sponge. That very day the lady found a cut on her tongue. A week later, she 
noticed an abnormal swelling of her tongue. She went to the doctor, and they 
found nothing wrong. Her tongue was not sore or anything. A couple of days 
later, her tongue started to swell more, and it began to get really sore, so 
sore, that she could not eat. She went back to the hospital, and demanded 
something be done. The doctor took an x-ray of her tongue and noticed a lump. 
He prepared her for minor surgery. When the doctor cut her tongue open, a live 
cockroach crawled out!!!! 
     
    There were cockroach eggs on the seal of the envelope. The egg was able to 
hatch inside of her tongue, because of her saliva. It was warm and moist... 
     
    This is a true story reported on CNN