Depending on where one is from, it is either soda or pop or soda pop. But one, just one, is a potential risk to an adult's health. It's sweet, tastes great and may be low on calories, does that matter? According to the research, no. A lifestyle that may be construed as unhealthy further exacerbates the health risk.
Fast Food Nation is an excellent terrifying book that underlines the crunchy issues about what we imbibe. Children drinking inordinate amounts of soda are at risk for diabetes among other long term health dangers. Coupled with the amount of High Fructose Corn Syrup (HFCS) in soft drinks does not bode well.