Which statement best describes the effect nicotine has on the central nervous system? 1. it acts as a stimulant and causes pleasurable feelings. 2. it acts as a sedative and relaxes the mind. 3. it acts as both a stimulant and a sedative.

i think the answer is strength

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.