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 did they start putting warning labels on cigarettes?" whose answer is 1966.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did the US start requiring warning labels on cigarettes
Useful Output:

Doc 1: With the passage of the Federal Cigarette Labeling and Advertising Act (FCLA, 15 USC 1333) in 1965, the US government mandated for the first
Doc 2: Health warnings first appeared on cigarette packages in 1966 and were most recently updated in 1984 to include the Surgeon General's warnings
Doc 3: Health warning labels have adorned cigarette packages since 1966, when they first appeared in the United States. And in the decades since, they have spread
Doc 4: Beginning June 18, 2021, these new cigarette health warnings will be required to appear prominently on cigarette packages and in advertisements
Doc 5: In the US, there have not been any changes to the text-only warning labels since 1984, which the AHA says have become stale and go unnoticed.