In order for disease to spread there is a chain of infection that needs to occur. what is the order of the chain? a. infectious agent, reservoir, portal of exit, vector, indirect contact transmission, susceptible host b. susceptible host, age, infectious agent, portal of entry, means of transmission, vector c. infectious agent, reservoir, portal of exit, means of transmission, portal of entry, susceptible host d. age, infectious agent, portal of entry, portal of exit, vector, susceptible host

1. cold turkey (no outside ). about 90% of people who try to quit smoking do it without outside support -- no aids, therapy, or medicine. although most people try to quit this way, it's not the most successful method. only about 5% to 7% are able to quit on their own.

2. behavioral therapy. this involves working with a counselor to find ways not to smoke. together, you'll find your triggers (such as emotions or situations that make you want to smoke) and make a plan to get through the cravings.

3. nicotine replacement therapy. there are several types, including nicotine gum, patches, inhalers, sprays, and lozenges. they work by giving you nicotine without the use of tobacco. you may be more likely to quit with nicotine replacement therapy, but it works best when you use it with behavioral therapy and lots of support from friends and family. and remember that the goal is to end your addiction to nicotine, not simply to quit using tobacco.

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