My grandpa used to smoke a great deal, and he wound up getting cellular breakdown in the lungs. Yet, I fail to really see how smoking can cause something like cancer growth. Isn’t cancer growth simply an infection that happens haphazardly? How does smoking really prompt that occurrence inside your body? It’s all so confusing to me.

Picture yourself as an urban area with many cells that are small in size but very powerful in your organs. Every cell has a designated duty, just like every citizen in the city is performing their job. Hence, all cells cooperate to make a stable city.

Recently, in the course of their regular operation, cells may also produce errors. This is similar to a construction worker who mistakenly builds a crooked building instead of the planned one. Generally, the immune system's surveillance mechanisms, called the body's defenses, identify and correct errors before they cause any problems.

However, when someone smokes, toxins enter the city. Those toxins can tighten the bonds of the workers' tools that comprise their very molecular DNA and possibly confound their ability to perform their correct roles. Soon, they cannot fix tools anymore, so a builder starts constructing crooked buildings.

The unpleasant smoke, which irritates the lungs and even causes airway inflammation, makes it slower and more difficult for the workers to breathe. Letting us put more obstacles in the way of them doing their jobs as if it's additional work for them.

Smoking, among the most deadly things we can undertake, is a potentially fatal addiction that damages many of the systems in our bodies. We do this when these mistakes re-occur over and over because of smoking, and one of those crooked buildings eventually becomes unsafe—it's like a cell transforming into cancer. 

You are giving smokers a chance to destroy their immune system, which means that they cannot defend their bodies from the spread of these deadly buildings, which further messes up things in the city.

Thus, in that very way, smoking is not a direct cancer cause. You can hardly imagine that a single infected cell would upset the balance here and there, but this is basically what it's like throwing a wrench into the well-oiled machine of your body's cells. 

This does not only cause mistakes, but it also makes it much easier for the cancer cell to take charge of your body. It is right that we must give up smoking and keep the city in which we live clean. Our body is a well-functioning machine.