Wasn't Rory in Afghanistan, where I assume it was legal, and maybe more part of the culture?
Islam has an interesting take on drugs for a start (assuming we're talking about the Muslim culture of Afghanistan). From years of socialising, I've been told only alcohol is explicitly forbidden - that is in the Koran. After all, "hashish" is an Arabic word (like "al cohol" ironically). I'm not a scholar though.
All of that said, it's more the legal than the cultural dimension. Otherwise Gove-y boy gets a free pass for planning to, and executing that plan, to break the law in the UK.
Gove is also a poster boy for why the "War on Drugs" has been an expensive and immoral failure. Countless billions wasted over decades, and it clearly didn't deter the Govester one iota. Which is the other side of the coin. If the law is supposed to reduce the harm due to drugs, it's failed since day one. All it's done is made a lot of criminals very rich - so rich that you have to question the sources of funding to some anti-drugs organisations and politicians. It's blighted the lives of countless people, and cost the country so much it could probably be expressed as a significant fraction of our GDP over 50 years.
In all my time since about the age of 14, I don't know a single person that has not tried drugs "because they are illegal", or because they had no way to source them. The only people who haven't tried drugs are the people who didn't want to try drugs. Legality or otherwise doesn't deter people and only encourages criminals with very low quality control standards. In fact the only thing we can know for sure about GoveyBaby and his snort of choice is that it will have been the cleanest you can get, and not laced with the shit they use to cut it down for the plebs. So no danger of an OD or reaction for Forrest Gove then. And strike me down if I say mores the pity.
As one that has a Fortean bent, I am fascinated by ethnobotany - in particular the suggestion that psychedelics - LSD in particular - can not only "treat", but cure alcoholism and some forms of schizophrenia ... but as a wise man once wrote: "If insulin got you high, diabetics would die."