Final answer:
E-cigarettes contain harmful substances like nicotine, cancer-causing chemicals, and toxic metal nanoparticles. Flavored e-cigarettes may also have diacetyl, linked to lung disorders.
Explanation:
E-cigarettes contain nicotine and cancer-causing chemicals such as formaldehyde and acetaldehyde. Additionally, they may contain toxic metal nanoparticles. Flavored e-cigarettes often contain diacetyl which can lead to a disorder known as 'popcorn lung.'
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