is tobacco a mind altering substance On Science: Can you smoke cigarettes without becoming addicted? Understanding Nicotine Effects on Brain

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Participants underwent periodic spirometry to assess lung function and a chest CT scans 15, 20 and 25 years after enrolling

Read more of our reporting in The New Cannabis Part of the vulnerability is because teen brains are still developing and undergoing changes related to pruning, a process in which the brain eliminates unnecessary neurons and neural connections, DSouza says