Well, I have differing opinions on this.
Drugs have a place in metal, just like anything you care to mention has a place in Metal
Beer (Tankard, Onkel Tom )
Partying (Onkel Tom again, Andrew. W.K.)
Weed ( Sleep, Spiritual Beggars )
Macaroni (Annihilator

)
Suicide ( Sentenced )
But, as drugs go, My ex's Dad had Marijuana Phycosis, which wasn't fun. It was very sad to see a person like that, everytime I saw him we had the same conversation "Hi, who are you...?" :zombie:
But I hate telling people what to do, so you have fun, there is a place in Metal for everything, I am discovering. But too much of anything is anyone's downfall.
Alcohol is bad, the biggest killer in fact, slightly ahead of cigarettes.
But the government makes money off these, the only reason Weed isn't legal in UK is because the Government can't tax it.