[dallasgop]

You can Goodle the subject and find a ton of stuff on it. This is a subject that has been studied out the wazoo, all with pretty much the same conclusion, but here are a few..

http://www.infectioncontroltoday.com/hotnews/41h883825.html

http://www.cdc.gov/mmwr/preview/mmwrhtml/mm4920a3.htm

http://www.doli.state.mn.us/rrif02sept1.htm


http://www.hc-sc.gc.ca/hecs-sesc/tobacco/facts/bot

http://www.clinicalhypnotism.com/id11.htmltomline/ch2_method.html

[Madame Dufarge]

Other Google out the wazoo stuff with pretty much the same conclusion