Since when have those products become physically addictive ? Are they injected with chemicals to increase their addictive capacity ?

Did you watch Supersize me? Obviously Fastfood *is* addictive. And yes they contain substances that increase the addiction. The fact that those are not forbidden does not mean they are healthy, does it?

you would see that the health hazards associated with those foods relate to the frequency which they are consumed.

Exactly like cigarettes.

To the mature part: "They" allow me to drive, and eventually kill one to many people in a single moment. So why should one not be allowed to kill himself slowly over a lifespan?