The peak year for the popularity of marijuana use among young adults (18-25 years old) was 1979, and it was still less than half.
According to your link, a poll in 1973 shows 43% of students having tried it with 51% in 1971. That 1979 figure is for people who are currently using it. I suspect the percentage that have tried it, rather than the percentage of regular users, is a closer fit to the percentage who would have supported legalization back then.
Furthermore, even if the percentage was under 50%, it's clear that once they grew older they didn't exert the massive influence over marijjuana policy that would have been expected. If 30% or 40% of 25-40 year olds actively support s...
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