It's funny how oblivious Americans are to the dangers of driving. This despite generally knowing people who have been badly injured or killed in vehicular accidents.
Car exhaust is also a big deal. Air pollution kills.
Instead of talking about the very concretely understood dangers of car culture, people want to spout total nonsense about sugar or freak out about a little second hand smoke.
Answer: Americans engage in more risky behavior than other OECD members (driving, we also drive worse than some OECD members, etc):
http://www.forbes.com/sites/theapothecary/2011/11/23/the-myt...
http://b-i.forbesimg.com/theapothecary/files/2013/11/Nationa...