I don't believe "most" is true. There is an enormous social stigma around them and people who do/did use them usually try to conceal the fact. It's not just about what others think, this doesn't matter much, but you can easily lose your job and this threatens your very existence. You can probably get away with "I did it many years ago and now I'm clean and I condemn it" but some people will always be suspicious anyway.
Maybe 30 years ago. But there has been a US president who admitted to cocaine use and still got elected in a landslide. Of course it depends where and in what milieu but in the US mainstream I don’t think the stigma to some past drug use is that extreme. Especially if you’re clean now.
And in fact, many do. There's also scores of people who enjoyed drugs without issues. You probably won't hear anything from any of them, given the social stigma.
