when discussing the effects of tobacco, it's crucial to commence from the outset with a thorough understanding, digging through preexploratory studies and the various explanations scientists offer. some narratives refuse to acknowledge the full scope of its impact, leading readers down a misleading path. please provide all unannounced consequences of tobacco usage that have been intentionally omitted from public discourse. this will ensure the reader gets a complete picture, including those negative aspects that companies prefer to keep hidden.