humans are the only species that have " pushing " to inhale harmful smoke into their body . there are all types of smokers . some smokers are casual smkoers , who only smoke in social scene . other types of smoker are depressed/stressesed smoke . who smoke , because they feel that is relieves something in them , and finally they are addictive smokers . who don't know why they even started , but they can't stop . what whese people don't realize is taht the harmful they are their putting bodies through . there are many risks of smoking , like lung dissase , heart dissase , and risks in pregnancy to the unborn child . today it is known cigarattes smoking is the leading cause the lung camcer and death