The mind is to be used primarily to learn about God and His requirements for eternal life, along with living happily in this present world. Each of these evils lead to bondage and destruction.
Drugs have enslaving-destructive effects on people's lives.
They create apathy in ones minds pertaining to what is 'right' and 'wrong'. Our sense of what is right and wrong becomes perverted. We are seeing this in our world today. One of the first things that Satan does is deceive us. Deception is a key thing in his lies.