Smoking rates have plummetted in the US thanks to education. younger generations smoke in far smaller ratios than their gandparents.
eating correctly and exercise need to be addressed more. the former first lady tried to make that her platform....and i believe she was confronted by Sarah Palin who believed Michelle Obama was trying to take away our freedom to eat cookies.
but, yes, preventitive medicine is key. and it is something that was stressed in Obamacare ( which is also why your annual physical has no out of pocket expense now)
but costs will not come down in any significant way so long as doctors get paid the same way car mechanics do. they should be salaried or reimbursed by the number of patients they see...not ala carte for every test, procedure, surgery they perform. thats how the rest of the world works