My belief that the sun will rise tomorrow is predicated largely on my own anecdotal experience and astrophysical data that I've never observed and am merely taking on faith from others.
Also anecdotally: my Dad made the same observations in the 60s that I did in the 90s. As a result, he hammered home early and often that potsmoking was an unacceptable activity and would be physically sanctioned. At first I never indulged out of fear, then out of filial piety. Then I noticed my Dad's experience was confirmed by my own.
I'll teach my kids the same way - it's called horse sense. Other people are free to raise their kids according to the results of surveys. And my kids will probably have to pick up the tab for their state-funded rehab program.