cigarettes and crack Marijuana cocaine rocks. Confiscated from suspected drug dealer. Kansas City, MO, Police Stock Photo Nicotine vs. Cocaine: Which Substance

Poor circulation and amputations : Smoking causes damage and scarring to small blood vessels which can lead to poor circulation to the feet and legs

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"Its probably fair to say that a long-term e-cigarette user is not going to die from tobacco-caused disease," says Thomas Eissenberg, co-director of the Center for the Study of Tobacco Products

Heeschen C, Jang JJ, Weis M, Pathak A, Kaji S, Hu RS, Tsao PS, Johnson FL, Cooke JP

TM, MP, and KA: Performed the experiments and analyzed the data

The KHOOR Way