Quote Originally Posted by Blowboy
I once heard THC opens up your veins whereas nicotine makes them narrower.
Can't remember where I got it from, probably because of the THC
Can anyone back this up?
As are you kind already said, this is air passages, not blood vessels. THC dilates your airways which allows your lungs to clear shit out more easily, while nicotine restricts them and keeps it in. THC does dilate your blood vessels too (which is why your eyes get red) but I don't think nicotine restricts them.
Quote Originally Posted by Kush Over
Carl Sagan was a pothead.

I suppose his achievements as an Astrologist and Astronomer were nothing more than the results of his cannabis abuse.

Damn that Mary-Jay-Wanna. Damn it to my pipe.
Carl Sagan was most definitely not an astrologist! As he himself said in his excellent essay, The Burden of Skepticism:

"If science were explained to the average person in a way that is accessible and exciting, there would be no room for pseudoscience. But there is a kind of Gresham's Law by which in popular culture the bad science drives out the good. And for this I think we have to blame, first, the scientific community ourselves for not doing a better job of popularizing science, and second, the media, which are in this respect almost uniformly dreadful. Every newspaper in America has a daily astrology column. How many have even a weekly astronomy column? And I believe it is also the fault of the educational system. We do not teach how to think. This is a very serious failure that may even, in a world rigged with 60,000 nuclear weapons, compromise the human future.

I maintain there is much more wonder in science than in pseudoscience. And in addition, to whatever measure this term has any meaning, science has the additional virtue, and it is not an inconsiderable one, of being true."