According to the National Highway Traffic Safety Administration (NHTSA) 41,059 people died in traffic crashes in 2007 in the United States (latest figures available), including an estimated 12,998 people who died in alcohol-impaired driving crashes. Drunk driving fatalities accounted for 32% of all traffic deaths last year, that is, on average someone is killed in an alcohol-impaired driving crash every 40 minutes in the U.S. (Source: NHTSA/FARS, 2008)
Only 41,059 deaths? Something I found interesting is according to the U.S. Centers for Disease Control and Prevention, 443,000 deaths were because of smoking http://www.cdc.gov/tobacco/data_statistics/tables/health/attrdeaths/index.htm
Just to keep things in perspective, also keep in mind they make laws about driving drunk, but it's still okay in non-driving legal situations (non-minors, etc). They didn't have to have prohibition to do that. Something to consider, what if most of the public doesn't want secondhand smoke in work related/public non-smoking areas?