553 - Logical Reasoning

Testifying before the Senate committee investigating charges that cigarette manufacturers had manipulated nicotine levels in cigarettes in order to addict consumers to their products, tobacco executives argued that cigarette smoking is not addictive. The primary reason they gave in support of this claim was that cigarette smoking was not regulated by the Federal Drug Administration.
For the tobacco executives' argument to be logically correct, which of the following must be assumed?

1. Substances that are not addictive are not regulated by the Federal Drug Administration.
2. The tobacco executives lied when they claimed that cigarette smoking was not addictive.
3. Some addictive substances are not regulated by the Federal Drug Administration.
4. There is no scientific proof that cigarette smoking is addictive.
5. Substances that are not regulated by the Federal Drug Administration are not addictive.