This is not a discussion on how drugs feel or how it feels to be on drugs, which is the only perceptive they would gain from taking them rather than observing or examining data.I'd say that people who haven't tried drugs do not understand exactly what it is, no.
It can be described to you, as can sex. You may understand what happens in a numerical order of things for example, but there are things beyond the written word.
I know it wasn't you who raised the original point, but seriously to think that one has to experience something directly before they can (and I'm not saying fully understand) make an informed decision about laws governing something is ludicrous.
I can imagine the scene now;
Mr brown: OK cabinet we need to examine the sentencing for murder cases, your homework for this week is to go out and murder someone, see how it feels then we can figure out what kind of sentence to hand out. See you next week.