Do you mean illegal drugs or all drugs like like, religion, caffeine, nicotine, viagra, etc....?
very good question!!
Alcohol is a drug and probably claimed more lives and illnesses than drugs.
So many song writers have probably wrote songs while under the influence of a bevy or two. I know Paul Weller wrote " that's entertainment" in a caravan while blootered oot his face. He wrote it in a very short time. This song is in the top ten of Weller's songs.
As for the illegal substances, if it was not for them what would famous songs that were wrote while drugged up sound like? would they have been written? Hendrix, Townshend, Clapton, Lennon, Barrett, Cash, and many many more, too many to mention or look up have all wrote masterpieces under the influence of illegal drugs.
In the news the other day the Scottish government ( or some of them) are wanting to legalise cannabis and give the abusers heroin free on the health service. This does not include England so if they went ahead and done this then all the addicts from England,Wales, Ireland and probably the rest of the E.U would want to come live in Scotland to get their free legal hit.
Maybe if they did this Scotland would be full of the best songwriters?
I am totally anti drugs.....then sometimes I am all for legalising them all after 30 years of excellent education in schools.
I have wrote a tune or two while under the influence and I still write one or two while having a whisky or 12. Problem I have with this is if I dont record it straight away then I sometimes forget how the rhythum went the next day and the lyrics become another file in the computer for a later day, and sometimes it never gets opened again.
Ken