Tar, carbon monoxide, nitrogen oxides, theyre harmful because they cling to the red cells in the blood and up to 15% of a smoker's blood may be carrying carbon monoxide round the body rather than oxygen.Smoking 'lower tar' cigarettes can increase the carbon monoxide levels as smokers inhale more deeply.Cigarette smoke has high levels of nitrogen oxide.
Hope that helps
Physical activity is important for everyone, but how much you need depends on your age. Adults (18-64 years) Adults should do at least 2 hours and 30 minutes each week of aerobic physical activity at a moderate level OR 1 hour and 15 minutes each week of aerobic physical activity at a vigorous level. Hope I helped :)
Adolescents is the term used to describe an organism that has reached the stage of puberty and is in development of offspring prodiction, with associated characteristics....
Psychological is the word you're looking for.
