Although several carcinogens were already known at the time (for example, benzo[a]pyrene was isolated from coal tar and demonstrated to be a potent carcinogen in 1933), none were known to be contained in adequate quantities in tobacco smoke
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When it comes to tobacco and cannabis odors, the smoke particles are tiny and can embed into porous materials like walls, carpets, furniture, and HVAC systems, making it challenging to remove without specialized equipment
However, the risks of smoking either commercial cigarettes or loose tobacco cigarettes are comparable and can lead to significant health issues