“The smoke from burning marijuana contains many more cancer-causing substances than tobacco.”
Taped statement (August 1979); Reagan is on record as opposing legalization of Marijuana: "I also want to applaud you for helping the people of Oregon fight a misguided minority that would legalize marijuana. That would be the worst possible message to send to our young people." Speech http://www.reagan.utexas.edu/archives/speeches/1986/073086a.htm (30 July 1986); Reagan's son Michael has disputed the fervor of his opposition: "Of course Dad was for legalization. … He wasn't crazy, he didn't want his kids in jail!"
"Reagan's Marijuana Comments Cause Stir" (11 May 2002) http://www.newsmax.com/archives/articles/2002/5/11/12343.shtml
1970s
Context: The smoke from burning marijuana contains many more cancer-causing substances than tobacco. And if that isn’t enough it leads to bronchitis and emphysema. If adults want to take such chances that is their business. But surely the communications media … should let four million youngsters know what they are risking.
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Ronald Reagan 264
American politician, 40th president of the United States (i… 1911–2004Related quotes
As quoted in Legalizing Marijuana : Drug Policy Reform and Prohibition Politics (2004) by Rudolph Joseph Gerber, p. 9; also in Hawking Hits on the Information Highway : The Challenge of Online Drug Sales for Law Enforcement (2008) by Laura L. Finley , p. 28, and "The Emperor Wears No Clothes: The Authoritative Historical Record of Cannabis and the Conspiracy Against Marijuana" (1994) by Jack Herer, Jeanie Cabarga, and Jeanie Herer, p. 29.
Disputed

Saint Hill Special Briefing Course 35 (19 July 1961).

Source: Don't Start the Revolution Without Me! (2008), Ch. 10 (p. 189)

“She blew more smoke toward me, a lazy game of cancer catch.”
Source: Gone Girl

Dialogue with trade unionists, February 2, 1999 https://web.archive.org/web/20051226071614/http://zpedia.org/Chomsky_on_pot.
Quotes 1990s, 1995-1999