Should people smoke or not smoke ? What are the pros and cons ?
Questions about how people ought to live always end up becoming religious questions ~~ always end up being arguments handed over to the prophets.
For example, when abortion began to be legalized in the US, it was initially treated as a purely civil matter. But when people began to have second thoughts about it, they turned to their prophets, and it soon became a religious squabble, with both sides lining up clergy to back them. In the same way, the question of legalizing drugs is now being debated in primarily practical terms ~~ but if it ever becomes a serious possibility, people of a certain turn of mind will undoubtedly begin combing scriptures to see what their prohpets have to say on the subject.
Giving the power of thought away, once again, to government and organized religion.
We can argue about issues for a thousand years, but there's never going to be an argument powerful enough to end the argument, because every argument has a counterargument. So, it is impossible to know what we should do.
We know how to split atoms, how to send explorers to the moon, how to splice genes, but we do not know how people ought to live. Culture allows us to have certain knowledge about things like atoms and space travel and genes, but there's no such thing as certain knowledge about how people should live. It's just not available. It's just not out there.
In other words, the best we can do ~~ since there's nothing 'out there' ~~ is to consult the insides of our heads and feelings. That's what's being done in the debate about legalizing drugs. Each side is preparing a case based on what's reasonable and whichever way they actually jump they still won't know whether they did the right thing.
There's simply no way to obtain any certain knowledge about how people ought to live. Doesn't that seem strange to you ? Considering the fact that this is by far the most important problem mankind has to solve ~~ has ever had to solve ~~ you'd think there would be a whole branch of science devoted to it. Instead, we find that not a single one of us has ever wondered whether any such knowledge is even out there to be obtained.
Not a very scientific procedure for such a scientific people.