And the original study: [link|http://bmj.bmjjournals.com/cgi/content/full/328/7446/977|http://bmj.bmjjourna...full/328/7446/977]
The [link|http://www.newscientist.com/article.ns?id=dn3557|mechanism]:
The mechanism for this effect is likely to be that the inhaled smoke stimulates the immediate production of macrophages - white blood cells that "clean up the system".
But these break down and lead to the production of blood clotting agents. "So if someone is teetering on the brink of a heart attack, this clotting is likely to tip them over," says West.
And sorry, it was 40%, not 60%. Same diff.