Countless scientific studies have acknowledged that certain drugs have tremendously harmful effects on the human body. Even though addiction is essentially a brain disease, when drugs similar to heroin and methamphetamine are considered, the dangerous effects aren't just confined to the brain as physical complications are likely to arise as well.

In this infographic, we take a look into the most dangerous drugs in the world, some of which are also the most addictive drugs you can find. Even though most of these substances are illegal in many countries, a lack of commitment to control the problem has unfortunately led to increasing levels of addiction.

Let us now take a closer look at the 4 deadliest drugs in the United States. In this infographic, we will discuss statistics in addition to both sort term and long term effects of each corresponding drug. The substances in this list are ranked in descending order of their deadly quotient.