All drugs should be legal. Its a breach of basic human rights not to. So long as you are not harming anyone else you should have the freedom to consume anything within the privacy of your own home.
If you take harmful drugs and are damaged or die from it then too bad, we lost an idiot, more air for the rest of us. Its not illegal to jump off a cliff. Also if drugs are legal then at least the drugs will be clean, and we will have more money to educate people about the dangers of harder, deadly drugs like alcohol and tobacco.