Except some people do need drugs to survive. Many people need Marijuana for a variety of reasons whether its pain relief for some or seizures for others.
Never been against those cases and it would never have been a problem if those were the only instances people used drugs.
People are not going to fool anybody by hiding their support for drugs behind the very rare medical use of some substances and yet you see stuff like "I support the right of use of substances like cocaine because there's people that might need weed to have a better life" pretty much everywhere.
Case in point something like the post above mine.