Why do people that have never taken a drug give damming advice to people who have?

MIght make them feel superior.Why do people that have never taken a drug give damming advice to people who have?
Do i have to be hit by a train to know that it will kill me. That is your logic.Why do people that have never taken a drug give damming advice to people who have?
Maybe they think drug users have destroyed too many brain cells to make an educated choice on their own.
Because there is so much information out there about how harmful and addictive drugs are. People should know better than to start using drugs in the first place. It's not very smart.