Heroin breaks down into morphine inside the human body. Brown must be dissolved with an acid such as vitamin C prior to injection, and is the best form of heroin for smoking. These cuts can be harmful to the user.
Some opiates are natural, and some are synthetic.
Heroin is semi-synthetic. Injecting heroin is the riskiest method to use in terms of overdose because the entire dose enters the body at once. Heroin is smoked by placing it on aluminum foil, heating the foil so that the heroin vaporizes, and sucking in the vapors through a straw or similar instrument. Smoking heroin takes practice, since the vapors produced can easily be lost. Each of these methods carries its own health risks.