How Do E-Cigarettes Work and What Are the Health Effects?

1. What is the principle of e-cigarettes?

The principle of e-cigarettes is quite similar; they work by heating a substance containing nicotine, vaporizing it for inhalation.

In the early years, the mainstream "e-liquid" primarily dissolved nicotine in propylene glycol and glycerin. By heating the coil, it forms vaporized droplets carrying nicotine. In addition to propylene glycol and glycerin, e-liquids usually contain a small amount of flavoring to adjust the taste. While not necessary, few people would accept a completely flavorless e-liquid that only has the sickly sweet taste of glycerin. There are many brands of e-liquids, and their main differences lie in the flavoring, as everyone's taste preferences vary.

The basic principle is quite simple, with no significant technical barriers; whether it’s the device or the "e-liquid," anyone can DIY if they want. (Note 1: The premise is that you don’t mind the high cost, appearance, and potential safety issues if you lack knowledge about electricity. Also, if you don’t mind the poor taste of your homemade e-liquid. As long as you graduated from middle school, you should be able to mix solutions by ratio or calculate power based on resistance and voltage.)

(Note 2: The "pod systems" that have gained popularity in recent years use nicotine salts. Due to personal usage habits, I haven’t explored this much, so I’ll leave it to others to answer.)

2. Health Effects.

Since the primary inhaled substance is nicotine, the health risks posed by nicotine in tobacco are similar to those in e-cigarettes.

I am not a medical professional, so I will leave the detailed effects of nicotine on the human body to qualified experts or relevant literature. From a non-professional perspective, it is known to increase the risk of cardiovascular diseases and have certain adverse effects on the reproductive system, increasing the risk of giving birth to malformed children.

However, it should be noted that since e-cigarettes do not involve combustion but merely vaporization, and their components are relatively simpler than tobacco, the substances ultimately inhaled by the body are also relatively purer. The only clearly harmful substance is nicotine, while tobacco, in addition to nicotine, also contains carbon monoxide, tar, and over 4,000 other confirmed carcinogenic or harmful substances.

Regarding cancer, it is worth mentioning that whether nicotine increases cancer risk is currently unknown; the established cancer-causing effects of smoking are attributed to the combustion products of tobacco.

Therefore, while e-cigarettes do pose health risks, they are significantly lower than those of traditional tobacco. However, lower does not mean harmless; nicotine remains a highly toxic substance.

The secondhand smoke from e-cigarettes is also similar to that of tobacco. Moreover, since it consists of vapor droplets, it settles faster in a closed room compared to cigarette smoke, which is visibly lingering. Thus, the impact of secondhand smoke on others is also considerably reduced, but whether it is completely harmless remains undetermined.

3. Do e-cigarettes really help with quitting smoking?

This section is primarily based on my personal experiences and feelings, so it may be somewhat biased.

If someone were to ask me face-to-face, "Do e-cigarettes really help with quitting smoking?"

I would answer that they do help a little, but then immediately follow up with a "but..."

Let’s first discuss the positive aspects:

The most obvious benefit is that if you are a long-time smoker, completely replacing tobacco products with e-cigarettes for a period can allow you to experience the physical changes after quitting nicotine dependence while still maintaining the habit of inhaling nicotine. This is mainly a matter of intuitive feeling.

Many long-term smokers experience issues like excessive phlegm, coughing, and shortness of breath, but due to years of smoking, they have become accustomed to it and do not take it seriously. These symptoms are primarily caused by other combustion products in tobacco. Therefore, completely replacing cigarettes with e-cigarettes for a while, most long-term smokers will noticeably feel that their phlegm has decreased, their throat is no longer itchy, and their breathing is much smoother, even feeling lighter when walking outside.

Since these are bodily changes that many have not experienced for years, they can vividly feel the harm of smoking, which is much more impactful than seeing photos, videos, or hearing explanations from doctors, as only they can feel their own sensations.

Many health-conscious long-term smokers, after experiencing such changes, may not even consider quitting smoking, but at the very least, they will sincerely believe that tobacco is not a good thing, rather than viewing it as a mere companion in life as they did before. #p#分页标题#e#

This might be the greatest boost e-cigarettes provide in quitting smoking, akin to the analogy often mentioned on Zhihu: at least "it lets someone who has been eating excrement for years know what rice is." This boost is indeed significant.

However, now comes the "but":

1. First, the experience of using e-cigarettes is not the same as smoking tobacco products. The most noticeable effect of nicotine is a throat hit and increased heart rate, while tobacco products provide a more complex sensory experience in terms of taste. Most importantly, the combustion of tobacco releases carbon monoxide, which can cause a slight dizziness, a part of the experience that many long-term smokers use to judge whether the smoke has "strength" or if it will "get them high."

Thus, since e-cigarettes do not contain carbon monoxide, they struggle to replicate the complex flavors of combustion. Additionally, without the accompanying taste of combustion, the throat hit from nicotine is more pronounced, and propylene glycol can be somewhat irritating to the respiratory tract.

Therefore, I personally recommend that long-term smokers trying e-cigarettes often describe it as "spicy, irritating, and lacking strength," leading to the conclusion that they "cannot get used to it" and thus "will not try it a second time."

So, even if the experience is good, if 90% of people do not accept it after the first try, what can be done? The bodily changes may take at least a week to feel some effects.

2) Even among those who do try it and feel the bodily changes, most people actually choose to use e-cigarettes as a substitute for tobacco rather than completely quitting smoking, including quitting nicotine. Including myself, for some, the reasoning is that if they quit e-cigarettes, their bodies may not experience more intuitive changes, and another part is that I am aware of my work habits; I cannot function without something to stimulate me. If I quit smoking, I might rely on theobromine (drinking strong tea) or caffeine (strong coffee, energy drinks, Thai Red Bull), which is also harmful to the body. So, I prefer not to change, and if I do quit, I might wait until I plan to have children. This is a valid reason to consider. (But currently, I have no plans; I can barely manage myself.)

I call this merely a substitute for smoking; it is certainly better than tobacco, but I do not consider it quitting smoking. (However, some people believe that this counts as quitting smoking, and I do not oppose that; I have even met people who think fish and shrimp do not count as meat.)

3) Some people cannot quit due to environmental work issues. As social animals, for some, quitting smoking is not something they can simply decide to do; the same goes for substitutes, especially in the south, where social interactions are more emphasized. There are still many people who feel pressured to smoke when offered a cigarette during business discussions, fearing that refusing might offend the other party. Even in schools, if everyone in a dormitory is smoking, you might end up inhaling secondhand smoke even if you don’t smoke. In such situations, we cannot deny that these issues still exist.

4) Quitting smoking or substituting requires self-control and awareness. I have mentioned in a previous answer that the habits of e-cigarettes and traditional cigarettes are different; e-cigarettes can be counted by puffs, while traditional cigarettes are generally counted by sticks.

The specific difference is that traditional cigarettes are usually smoked until finished, while e-cigarettes can be taken up at any time for a puff, and you cannot see a finished stick or half a stick.

Therefore, whether substituting or quitting, you need to establish a measurement method from the start. Some e-cigarette devices provide statistics on how many puffs you have taken, or you can observe the consumption of e-liquid throughout the day and set a standard of "I have relieved my nicotine cravings enough."

Otherwise, being able to take a puff at any time can lead to situations where someone who previously smoked only a few traditional cigarettes ends up constantly puffing on an e-cigarette, resulting in a higher nicotine intake than before, which is not ideal.

At the same time, deliberately controlling the amount still requires self-control, and we know that our self-control ability is limited each day. This can lead to a breakdown of such control.

For example, I personally completely replaced smoking with e-cigarettes for about five years, but recently, after nearly half a year, I have returned to smoking traditional cigarettes. While writing this answer, I am again experiencing discomfort with excessive phlegm and shortness of breath.

I am now more aware of these issues than before, and I still say in this answer that tobacco is not a good thing, which is sincere.

But why did I return to smoking traditional cigarettes? Initially, it was because my studio address was flooded during the summer for two consecutive years, and every time I had to clean and maintain the equipment, it became overwhelming, compounded by some family issues. Since the summer of 2017, my life and work have been increasingly challenging, culminating in a breakdown in the summer of 2018. #p#分页标题#e#

In such circumstances, how much self-control can one maintain? There were even moments when I thought, "Just continue to ruin myself." Although I realized this thought was dangerous, I managed to control it.

Not only did I return to smoking traditional cigarettes, but I also occasionally drank excessively and bought new games to escape without restraint.

Indeed, I did not maintain control; I admit my self-control is not strong enough. After four to five years of substituting, I returned to square one overnight.

Thus, I believe this is the key to quitting smoking: it requires clear reasons and, most importantly, the ability to maintain self-control when those reasons arise to ultimately achieve your goals.

However, life is cruel and ever-changing, and maintaining self-control is already a significant achievement.

So, do e-cigarettes help with quitting smoking? Yes, but help does not mean you will accept it. Even if you can accept it, having e-cigarettes does not guarantee you will quit smoking; everyone’s situation is different.

It’s like buying a bunch of gym equipment for your home; it doesn’t necessarily mean you will achieve a perfect physique.

E-cigarettes are merely an item with the aforementioned attributes; they are not a magic solution for quitting smoking, nor are they a healthy product, although they are significantly less harmful than traditional cigarettes. Ultimately, whether you can quit depends on yourself.

If you have enough self-control, nicotine patches or lozenges can also help you; however, e-cigarettes are more aligned with previous habits and offer flavor adjustments.