Whether a plant or substance is natural or artificial does not justify smoking it. Regardless of its essence, smoking is never the right way for consumption. Before anyone can attempt to justify smoking, they have to first explain how smoke is processed by the human body.
The body has built-in mechanisms to digest solid food, liquid (or steam), air (or gas) and last but not least, light. The digestion process of each one of these elements can be explained and the mechanisms that are responsible for their processing can likewise be easily identified. For example, let us take a very basic look at the processing of air. Each time we inhale air, it first enters our nasal passage; then goes through our trachea and into our lungs where it gets absorbed by our alveoli before entering our bloodstream.
The critical problem with smoke is that there isn’t any mechanism in the body to digest it. In fact, smoking interrupts the body’s ability to process air. This explains why people who smoke, whether cigarettes or marijuana has some degree of breathing complication, which becomes more apparent when they try to exercise. Smoking destroys the microscopic air sacs in the lungs known as alveoli (as previously mentioned). The alveoli play a vital role in the exchange of oxygen and carbon dioxide.