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Think about cigarettes and lung cancer. Generally only smokers who've been smoking 30 years or more get lung cancer. Now imagine that cigarettes were invented 20 years ago and became widespread in use for only the last 10 years.
Think about cigarettes and lung cancer. Generally only smokers who've been smoking 30 years or more get lung cancer. Now imagine that cigarettes were invented 20 years ago and became widespread in use for only the last 10 years.