You can't put it that way. Part of understanding the effects and experience of drug use requires the actual experience of drug use, unlike studying cancer.

It's like someone criticizing the taste of a mango without ever experiencing eating a mango directly, or other life experiences like sex, having a child, riding a bike for the first time, etc...

It's more like: "If you haven't ever tasted a mango, you can't really comment on the experience of it."