Those who are generally able to understand and then recognize the dangers will have the ability to do so from young age, <sarcasm>Which is why heroin addicts,

Those who are generally able to understand and then recognize the dangers will have the ability to do so from young age, <sarcasm>Which is why heroin addicts, quit when they choose, and have zero issues staying off the above. Which is why after even a few doses, they never become horribly addicted, and end down a path of self destruction.</sarcasm> Addiction means logic, and choice go out the window.