SUBSTANCE ABUSE is unhealthy.
Too much of the wrong thing at one time will harm you one way or another.
When you take in drugs, you acknowledge that you are putting an external substance into your body that has potential to cause unwanted effects.
If you're fine with that, great, that's your cup of tea.
If not, just don't do it, but don't get preachy. Assume that other people know what they're doing and don't act like a pompous bastard.
aka get off that high horse.