How do nicotine and tobacco cause cancer?

Nowadays, it is a well-known fact that nicotine and tobacco cause cancer. However, it is important to understand why this is the case as well. The main reason why this occurs is because nicotine is linked to a process known as epithelial-mesenchymal transition (EMT). This is involved in the development of malignant cell growth. Moreover, nicotine interacts with the tumor suppressor CHK2, undermining its defense against cancer. Finally, nicotine can speed up cell growth and reduce the effect of cancer treatments.

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if your boyfriend is cheating on you, my best advice to you is to dump him, he's only going to drag you down. and if you do, don't fret there's plenty better that know how to treat a person right. i mean honestly, the whole point of a romantic relationship is love, and if you love someone you aren't going to cheat on them. i do believe in second chances, but why would he cheat in the first place? i personally feel that if someone cheats, they ruin any chance they wanted/had with you. i wish you the best of luck with this, hang in there.