How Many Drug Addictions Start in Heavy Smoking? (10 Points)?

Question by Eva: How many drug addictions start in heavy smoking? (10 points)?
Most well-researched answer gets 10 points for best answer!

Best answer:

Answer by Robert W
Here are a few links which marry smoking with increased chance of drug addiction. They all agree that teens who smoke are 5 times more likely to begin using other drugs.

http://www.reuters.com/article/idUSN2327528220071023 – Reuters news article

http://www.smh.com.au/news/World/Smoking-linked-to-teen-alcohol-drug-use/2007/10/24/1192941123136.html – Sydney Morning Herald news article

http://alcoholism.about.com/od/teens/a/teen_smokers.htm – About.com news article

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