Mr. C wrote:
Drugs give the illusion of broadening the mind, when really, you're just high.
That applies to some substances, but not all.
Substances in the category of "stimulants" do generally increase one's capacity to process sensory data, emotional data or other data, depending on the substance.
Psychedelics also can broaden the mind, but in a different way. It's pretty common to learn more about oneself and the world one lives in during a single LSD trip than during a lifetime of therapy.
Mr. C wrote:
I feel that the best artist's are those who need not rely on some mind altering substance in order to be imaginative.
Relying on some mind altering substance is never a good thing.
Using it responsibly without having to rely on it, however, allows one to unlock potential that's impossible to unlock otherwise... with but limited downsides to it.