Does chewing tobacco contain fiberglass?

[Crafter_Man]

There appears to be a widely-believed and long-standing rumor that manufacturers of smokeless tobacco (a.k.a. "chewing tobacco", "dip", "snuff", "chew") put fiberglass in their products. According to this rumor, the purpose of the fiberglass is to make thousands of tiny cuts in the skin on the lips and inside of the mouth. The cuts allow the nicotine to come in direct contact with blood vessels, thereby greatly increasing the rate & quantity of nicotine delivery.

I did some google searches. A number of sites claim this is a fact. But I remain skeptical.

Anyone know anything about this?