Some cigarette brands are likely to be far more addictive than others, new research warns. For the first time, scientists have measured the amount of super-addictive "freebase" nicotine different cigarettes deliver to the smoker. Like crack cocaine, freebase nicotine vaporises and passes rapidly through the lungs into the bloodstream. Because it reaches the brain so quickly it is thought to be more addictive than normal nicotine, which stays in the form of sooty smoke particles. Until now it has not been known how much freebase nicotine various types of cigarette contain. The new research, from a team at Oregon Health...