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That's why they're not as commonly used

Effects of passive smoking on health

Continuous research and development efforts are concentrated on improving biodegradability rates, enhancing filtration efficiency, and optimizing manufacturing processes to make sustainable solutions more cost-effective and scalable

In a key paper from 2012 it was the largest and longest-running study to date, testing 1,037 people at age 13 and 38 scientists at Duke University found a dramatic drop in intelligence among long-term marijuana users suggestive of a neurotoxic effect of cannabis on the adolescent brain, they wrote in PNAS

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