Dude i have many pages of this stuff.
http://www.associatedcontent.com/article/261745/some_scientists_believe_soda_pop_may.html
Anyways doesn't really matter bottom line pop is bad for you regardless.
yeeeuukk, that article is terrible.
First off, it has absolutely no sources for anything in the article. Second it uses the time honored tactic of quoting some sciency type, even if he is doing legitimate studies, and then draws some conclusion out of the context of the original source.
This xkcd comic shows exactly what I'm trying to say.
http://www.xckd.com/882/As for pop is bad for you....
Yes pop is bad for you.
So is water
as well as air
Too much of any and it is certainty bad for you.
Generalizing every sugared carbonated drink as bad is a bit much, you cant quite hold home brewed birch beer, and bargain basement generic colored sugar water to the same light.
I think it would be more accurate to say, pop has more negative than positive qualities.
Moderation is a good option when faced with things that are potentially detrimental for your health, whether that be alcohol, pop, or In and Out Burgers (tasty... tasty... in and out burger).
As for your parents smoking...
This is a tough one, there really isn't a "good" answer, just options.
It mostly depends on your parents. And how you think they will react to something, there will not be any one thing that dissuades your parents from smoking, more like a war of attrition.
Something to try would be to go to a welding supply, and get a welding respirator
http://www.amazon.com/3M-R8515ES-N95-Welding-Respirator/dp/B000P0KG0E/ref=sr_1_1?s=hi&ie=UTF8&qid=1302866896&sr=1-1It sounds silly, but hey it will actually protect you from the smoke. So if your parents refuse to stop smoking, just start wearing these, and when your parents accuse you of being silly, it's no more silly than them smoking indoors with their children.
It will be a lot more effective (and less expensive) than buying an air filter, since those aren't really that effective.
If you cant get them to stop smoking all together, try a compromise, such as they can only smoke outside, or not in a closed car with you. Smoking inside a house is unacceptable.
Take small steps, it will be exceedingly difficult to convince them all at once.
To everyone saying it's imposable, perhaps you just haven't been determined enough...
