Jane, there are lots of statistics there, but I found absolutely none proving risk from outdoor smoking.  Even lifelong steady concentrated indoor levels at 1960s "Mad Men" levels has had difficulty in proving a risk.  If you examine the results of all 130ish studies done on lung cancer and ETS between 1980 and 2000, you'll find that only about 1 in 10 was even able to pass the bare minimum test of statistically significant correlation... which is a much weaker standard than any proof of a "cause" between two things.

Link:  http://www.nycclash.com/Philly.html#ETSTable

Could you point me to the ones you felt proved a risk from outdoor smoking such as this ban is referring to?

Thank you.

- MJM