What Are the Main Harms of Nicotine, and Is the Nicotine in E-Cigarettes Harmful to the Human Body?

What are the main harms of nicotine, and is the nicotine in e-cigarettes harmful to the human body? I want to say: I am not a completely "toxic" substance! In fact, I am mild and may even be beneficial!

First of all, I must say that everything has its pros and cons. I have my benefits and drawbacks, but people often associate me with lung cancer, respiratory diseases, and heart disease because I have the highest content in tobacco, which is all about tobacco! You have misunderstood me!

I, nicotine, am an alkaloid. Many solanaceous plants, including tobacco, chili peppers, eggplants, tomatoes, and potatoes, contain me! Imagine, when you eat a plate of Di San Xian, that’s me in full! The hot pot base that people love worldwide also contains me! Does that mean Northeasterners and Sichuanese have the highest nicotine content?
The main misunderstanding about me is due to my common name, "tobacco alkaloid"! There’s nothing I can do; I have the highest content in tobacco! However, many people attribute all the harms of cigarettes to me! Although some say I can accelerate heart rate and raise blood pressure, the real culprits causing lung cancer, respiratory diseases, and heart disease are carbon monoxide and tar, which invade your blood vessels and harm your health! Recently, Dr. Paul Newhouse, a nicotine researcher at Vanderbilt University, stated that the addiction to cigarettes is primarily caused by MAOIs (substances like nitrosamines), which increase your desire to smoke, not me!

Having mentioned the misunderstandings about me, I must also address my drawbacks in the interest of fairness and transparency. I do pose certain risks to humans, but only under strict conditions! For instance, when humans inhale me, it can cause an increase in heart rate and systolic blood pressure, and blood vessels may constrict. So if you have high blood pressure or cardiovascular diseases, don’t come looking for me! Forcing me upon yourself will only make you uncomfortable! Even healthy individuals should be cautious; excessive intake can lead to rapid heartbeat, headaches, and nausea! Continuing to consume me at that point could be fatal! According to research by Professor Bernd Mayer from Freiberg University in Germany, an intake of over 500mg of nicotine can be lethal! That means you would have to smoke over 500 cigarettes continuously, and all the smoke must enter your body without exhaling! Of course, if you don’t smoke, consuming 188.68kg of eggplant in one go (with nicotine content of about 2.65mg/kg) could also lead to a fatal outcome!
Upon careful consideration, I, along with tar, carbon monoxide, and nitrosamines (MAOIs) form a perfect toxic trio. There’s meat, dairy, and output! Tar and carbon monoxide wreak havoc on the human body, causing various diseases; MAOIs are the addictive source but feed me with toxic praise; while I am left with a mocking face being beaten by humans! What a bunch of toxic companions!

These toxic companions overshadow my benefits to humans! Next, I want to mention that I do have some advantages! First, I leave your body completely clean within two to three days, with no residue! Before I leave, I also help stimulate and improve your cognitive abilities, consciousness, and memory. Professor Bernd Mayer has stated that I can assist in treating cognitive disorders, Alzheimer’s disease, ADHD, and schizophrenia!

Moreover, I am your little mosquito-repelling helper. Do you know why there are rumors that eating eggplant can repel mosquitoes? Although the rumors may be exaggerated, mosquitoes indeed fear me! Because I am lethal to them!

Dear human friends, when will you be able to face me? I have been infamous for too long! Even after separating from the toxic companion tobacco, I still find myself in a difficult position with vaping, leading to both of us being criticized. We can only huddle together in a corner, shivering.