When someone refers to "losing a friend to drugs" it doesn't mean they quit hanging out with them because they became total losers, it means the fu*ker died from an overdose, burned to death in a Methlab explosion, tried to rip off the wrong mofo's, got loaded and drove, got popped by Dudley Doright and got azz-punked to death in prison, had a psychotic episode and ate a bullet, or got some nasty infection from a needle they found in a wastebasket.

If losing a friend to dope only meant they turned into total losers then I could say 98% of my high school class was "lost" to dope.

By the way the aforementionned scenarios all happened to people I was aquainted with.
Oh yeah, one more thing: Comparing weed to Coke and crank is like comparing Laughing Gas to Zyklon-B and Phosgene.