Annoying to many — but not a health risk to any — secondhand smoke is archetypal junk science.
The Washington Post editorializes:
THE DISTRICT is poised to join the growing number of jurisdictions that have banned smoking near parks, recreation centers, public trails and bus stops. Anything that discourages smoking and protects people from the harmful effects of secondhand smoke is worthwhile. But the city needs to do more than extend outdoor smoking restrictions if it wants a truly effective and comprehensive tobacco prevention program…
The danger of secondhand smoke is lower outside than inside, but there are still risks, with children particularly susceptible. “Let the smokers move away from recreation areas and parks and bus stops,” said Council Member Mary Cheh (D-Ward 3) in a rebuke of the argument that people who want to avoid secondhand smoke should just walk away.