The difference between pot and cigs for me, is I fall asleep if I smoke pot.
From what I understand about it's history, one of the BIGGEST opponents to hemp was a big timber giant who was making millions on his timber to paper mills. Hemp created a big competition to timber, because it grows faster and makes a better product. He probably buddied up (financially) with the politician you're talking about.
Most recently, we had an attorney general, who was once a senator who was also a religious nut, who had some crazy idea's about pot. Him being the US AG, made the pro pot industry hard to chance taking on the feds. From what I understand, even Obama, who was supposely pro choice when it come to pot, still had his DEA going after US growers and sellers.
There's just too much money to be collected in confiscation and fines to let that kind of money slide. Now a days, a lot of states are legalizing it, so they can collect the tax on it.
Money was the reason it was made illegal. And money is the reason why it's becoming legal.
In other words, the government cares about one thing. And one thing only. Well make that 2 things.
Money & control.