Substance abuse like alcohol drinking, cigarette smoking, tobacco addiction, dependence on drug, etc. are all touted to be mood-altering things which can cause a pleasurable response in users. This momentary happiness instigates a person to cling onto it and soon this becomes an addiction. Excessive and continued use of these substances causes major health hazards to a person using it. These substances have psycho-active effects on a person and even the World Health Organization confirms that substance abuse, smoking and alcohol consumption are major factors responsible for deaths. Though studies show that minor doses of alcohol are beneficial for health, no study shows that minor smoking has the same effect on human beings.