The first 2 paragraphs in my previous response contained information about nicotine alone, with the final 2 paragraphs going into detail on other associated harms that typically come along with nicotine consumption due to the most common method of administration being cigarettes and tobacco products. however as mentioned earlier, the first 2 paragraphs in my previous response were about nicotine alone.

here is an extended version of those 2 paragraphs with a bit more clarity:

Nicotine is a highly addictive chemical found in tobacco products. It can cause an increase in blood pressure, heart rate, flow of blood to the heart and a narrowing of the arteries (vessels that carry blood). Nicotine may also contribute to the hardening of the arterial walls, which in turn, may lead to a heart attack.

Nicotine poses several health hazards. There is an increased risk of cardiovascular, respiratory, gastrointestinal disorders. There is decreased immune response and it also poses ill impacts on the reproductive health. It affects cell proliferation, oxidative stress, apoptosis, DNA mutation by various mechanisms which leads to cancer.

Some of the side effects of nicotine use are stomach pain, diarrhea, nausea, vomiting, headaches, back pain, dizziness, increased heart rate and nervousness.
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