Money controls men.
Men make laws.
Laws make and controls men.
That’s the cycle of a state.
A look at the economics of tobacco and Alcohol will give you the answer to which you seek.
Any man who plant, harvest and sell his weed wherever he likes (even in his room) meanwhile Alcohol comes with a lot of process thereby increasing it’s market price. Even though there are bootleg alcohols, these aren’t healthy as they aren’t distilled properly. Meanwhile, there’s nothing as unhealthy weed.
Also, the prohibition of weed was a racially inspired law. Harry Anslinger, the first Federal Bureau of Narcotics commissioner, was a renowned racist. Blacks and Rastafarians are the predominant users of marijuana so a way to stifle the hands of blacks, outlaw something they love and they’ll try to get it illegally then you can legally jail them.
Although this is secondary (to me). The primary reason remains financial reasons. Tobacco is a highly profitable cash crop. Ethanol is distilled from fermented crops which are taxed on.
Governments always gave excuses of health risks.
Smoking contains carcinogens. People invented vaping and brownies thereby eliminating 100% of the harmful carcinogens.
Anyone can grow weed in his/her parlour and harvest it. Dry it, grind it and smoke, vape, bake, eat without a penny entering the governments pockets.
Also, with the influence the US has over other countries, if the US federal government remove restrictions on weed, other countries will. Look at Europe. Most countries there are progressive enough to allow weed.
It has no harmful effect on the body. It cures some certain ailments (even the FDA acknowledges this).
Why is it then not allowed? Because if it were grown, half the cotton growers, nylon and rayon manufacturers, and timber products people in the world would go out of business.
Hemp happens to be one of the most useful, strongest, toughest, longest-lasting materials on your planet. You cannot produce a better fiber for clothes, a stronger substance for ropes, an easier-to-grow-and-harvest source for pulp. You cut down hundreds of thousands of trees per year to give yourself Sunday papers, so that you can read about the decimation of the world’s forests. Hemp could provide you with millions of Sunday papers without cutting down one tree. Indeed, it could substitute for so many resource materials, at one-tenth the cost.
And that is the catch. Somebody loses money if this miraculous plant—which also has extraordinary medicinal properties, incidentally—is allowed to be grown. And that is why marijuana is illegal in your country.
It’s the same reason Nigeria has refused to implement any climate change laws, invest in renewable energy, subsidize costs of electric cars and solar panels all because of how much we make from oil despite knowing the harmful effects it has on the environment and body.
Politicians get campaign money from companies that know this will destroy their business model.
Politicians make retrogressive laws in order to keep the cash flowing, We little beings are punished by those laws