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Because of its addictive chemicals, quitting smoking is one of the most difficult challenges many people face

I started smoking in college because everyone was

The amount of nicotine in cigarettes varies, but the average one contains 9-30 mg, most of which is concentrated in the cigarette butt

Cartilage, a smooth tissue, covers the ends of the thigh bone and shin bone and the underside of the knee cap

Clinical signs are usually noted within the hour

Health and Human Development New research shows that people who wake up, smoke, and return to sleep may need mental health support to quit Credit: Getty Images - KatarzynaBialasiewicz