You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when were tobacco ads banned in the us?" whose answer is the 1970s.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when were tobacco ads banned in the us
Useful Output:

Doc 1: It has been decades since Congress banned cigarette ads from U.S. airwaves, but questions on the law are increasing with the new e-cigarette
Doc 2: Warning labels were ordered on cigarette packs, and television and radio cigarette ads were banned in 1971. Undeterred, tobacco companies
Doc 3: A ban on cigarette advertisements on TV and radio (specifically those stations broadcasting on FCC-regulated airwaves) went into effect in 1971.
Doc 4: Yes. TV ads for cigarettes were banned in the US effective January 1, 1971. There are no such restrictions on firearms advertising.
Doc 5: On April 1st of 1970, Richard Nixon signed legislation banning cigarette advertising on radio and TV in the U.S.. Former president Richard Nixon