Figuring out which drug is the most dangerous in the world is harder than you might think because a lot of factors need to be considered, from lethality to the damages caused to a person's life, the lives around them and to society in general.
In terms of lethality alone, the most dangerous drug is actually botox. A person weighing 150 lbs. would die if they swallowed a mere 0.00000007 grams of the controversial cosmetic.
But nobody's swallowing botox recreationally (we hope), so in terms of the most harmful among common recreational drugs, heroin tops the lists of many researchers because of the intense physical, psychological and social harm it causes. Heroin is highly addictive, causes harm to the body as well as the mind, and often isolates addicts from friends and family. And while other opioids like fentanyl and carfentanil are much stronger and more lethal than its narcotic cousin, they aren't abused as commonly as heroin, so they are arguably not as dangerous.
However, if you define dangerous drugs by the damage they do to society, their involvement in crime, the costs of dealing with their effects and their potential for abuse around the world, then the most dangerous drug is alcohol. Beer, wine and spirits are consumed by the majority of the world's population, are commonly abused and kill at the average rate of one person every 10 seconds.
So depending on your definition, the most dangerous drug is botox, heroin or alcohol.
To learn more, check out the video above.