The smoke from burning marijuana contains many more cancer-causing substances than tobacco.
Source, in full
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 (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!"