An author's credentials can determine a health source's credibility. None of the other options would apply to credibility. When it comes to health, if you want to make sure that what you are researching or reading is authentic and reliable you need to find out whether the author is a professional health expert or not. You can do this by finding out their credentials.
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Set a goal to quit. To beat drug addiction, you need to set a goal to quit. You may not be able to do it all at once, but setting the goal will help you chart your next steps. <span>Make a list of the harmful effects of your addiction. Writing down a specific list of the ways in which your addiction is negatively impacting your life can give you a jumpstart toward changing your behavior. Rather than framing the addictions effect in general (i googled it) </span>