“There was a discussion in one of Polish TV stations. In that discussion, I told that mountaineering causes much more disasters than marijuana does. I do not know anyone who would die by marijuana, and some of my mountaineers friends paid off their passion in disability. But the presenter had a prepared punch line – she said that 85 percent of Poles are against the legalization of marijuana. I added then that in the eighteenth century, 96 percent of Poles were for smoking witches. Unfortunately, my punch line was cut out. And in this simple way, the media demonize the problem.”

Source: Liberty A to Z (2004), p. 55

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.

America (1956)

2016, Interview with CNBC's John Harwood (August 22, 2016)

As quoted in Busted : Stone Cowboys, Narco-lords, and Washington's War on Drugs (2002) edited by Mike Gray

Source: Misattributed, P. J. O'Rourke, as quoted in Busted : Stone Cowboys, Narco-lords, and Washington's War on Drugs (2002) edited by Mike Gray.

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

Diaz was asked whether his pot smoking was getting in the way of his fight career after testing positive for marijuana in a post UFC 143 drug test. Diaz was on a 5-year suspention, which was later reduced to 18 months (2012)

Rolling Stone interview (1988)