what does heroin do to the human body?
340634
Heroin deteriorates the body.  It also weakens the enamel which holds your teeth together.  Heroin is deadly if you overdose and not worth the experimentation if you want more out of life than a "fix".
75607
Human Growth Hormone (HGH) is a scam.\n\nNasal deliver is faster that is why coke users sniff it. Nasal is not with out side effects though.\nPills tend to last longer because they take longer to digest.
545368
How Smoking Affects Your Body\nThere's hardly a part of the human body that's not affected by the chemicals in the cigarettes you smoke. Let's take a tour of your body to look at how smoking affects it.\n\nStarting at the Top\n\nAs a smoker, you're at risk for cancer of the mouth. Tobacco smoke can also cause gum disease, tooth decay and bad breath. The teeth become unsightly and yellow. Smokers may experience frequent headaches. And lack of oxygen and narrowed blood vessels to the brain can lead to strokes.\n\nLungs and Bronchi\n\nMoving down to your chest, smoke passes through the bronchi, or breathing tubes. Hydrogen cyanide and other chemicals in the smoke attack the lining of the bronchi, inflaming them and causing that chronic smoker's cough. Because the bronchi are weakened, you're more likely to get bronchial infections. Mucus secretion in your lungs is impaired, also leading to chronic coughing. Smokers are 10 times as likely to get lung cancer and emphysema as nonsmokers.\n\nSmoking and the Heart\n\nThe effects of smoking on your heart are devastating. Nicotine raises blood pressure and makes the blood clot more easily. Carbon monoxide robs the blood of oxygen and leads to the development of cholesterol deposits on the artery walls. All of these effects add up to an increased risk of heart attack. In addition, the poor circulation resulting from cholesterol deposits can cause strokes, loss of circulation in fingers and toes and impotence.\n\nSmoking and the Body's Organs\n\nThe digestive system is also affected. The tars in smoke can trigger cancer of the esophagus and throat. Smoking causes increased stomach acid secretion, leading to heartburn and ulcers. Smokers have higher rates of deadly pancreatic cancer. Many of the carcinogens from cigarettes are excreted in the urine where their presence can cause bladder cancer, which is often fatal. High blood pressure from smoking can damage the kidneys.\n\nThe Results\n\nThe health effects of smoking have results we can measure. Forty percent of men who are heavy smokers will die before they reach retirement age, as compared to only 18 percent of nonsmokers. Women who smoke face an increased risk of cervical cancer, and pregnant women who smoke take a chance with the health of their unborn babies.\n\nBut the good news is that when you quit smoking your body begins to repair itself. Ten years after you quit, your body has repaired most of the damage smoking caused. Those who wait until cancer or emphysema has set in aren't so lucky—these conditions are usually fatal. It's one more reason to take the big step and quit now.
984714
One obvious one if the user injects heroin is track marks on the arms or behind the legs.
303457
Cocaine produces a wide range of physiological effects in humans, including the stimulation of a plethora of emotional experiences. When people take cocaine, they become euphoric, highly active (locomotion, tremors, and tics), and more talkative than normal. They experience feelings of extreme power and alertness. This initial high is followed by bouts of severe anxiety, paranoia, and depression, which often lead to addiction. Those who become addicted to the drug often turn the habit into an obsession, so that they devote more, and more of their time and money to acquiring and using the drug. \n\nWithdrawal from cocaine can cause a drastic fall in the level of extracellular dopamine in the nucleus accumbens (Rosetti 1992). This decrease is thought to be caused by an increased secretion of dynorphin, one of the endogenous opioids.\n\nmore information in\nhttp://www.macalester.edu/psychology/whathap/UBNRP/Dopamine/cocaine.html\n\n \n(AP) Chronic cocaine use harms brain circuits that help produce the sense of pleasure, which may help explain why cocaine addicts have a higher rate of depression, a study suggests \nhttp://www.cbsnews.com/stories/2003/01/01/health/main534934.shtml
362536
Are you talking about medical narcotics? Or illegal narcotics?  Are you refering to opiates? Both the legal and illegal opiates are a tough drug to kick.  There is huge problem in the US with prescription opiates. Opiates used to mange pain are wonderful. But opiates used in a non medical setting are destroying lives. Even when prescribed for pain many people become addicted and lives are ruined.
489186
it affects your lungs thats it
145209
alcohol thins your blood.  The same with tattoos and piercings.
617756
Points of Interest:\n\n1.) TRIPLE MAXIMUM LETHAL DOSE EVEN FOR SEVERE ADDICTS: At least three days after his death, Kurt Cobain's blood contained 1.52 milligrams of morphine per litre (mg/L) plus traces of a "diazepam-like" substance. This level is widely known to represent three times the lethal dose of heroin, but it is not commonly understood that this level is three times the lethal dose even for severe heroin addicts. Generally, a blood morphine level of 0.5mg/L is caused by 75 mg - 80 mg of heroin, the established maximum lethal dose, even for severe addicts. A blood level of 1.52 mg/L generally indicates an original dose of approximately 225 mg - 240 mg of heroin. \n\n2.) INCAPACITATED OR DEAD BEFORE GUNSHOT: Large overdoses of heroin by heroin addicts are a phenomenon which is well understood. Research clearly shows that an overdose in the range of that received by Cobain would lead to immediate and complete incapacitation and/or immediate death. \n\n3.) OTHER FACTORS ENSURED OVERDOSE LETHALITY: The 1.52 mg/L blood morphine level does not compensate for the presence of diazepam, or Cobain's low body weight, both of which are well proven to substantially increase the lethality of the heroin. \n\n4.) CASE UNPARALLELED IN SUICIDE & OVERDOSE REPORTS: A review of 3586 suicides, including 760 violent suicides, shows no case involving both a gun and narcotic overdose of any kind, supporting theories regarding the absence or extreme rarity of violent suicide among addicts. \n\n5.) CASE CONSISTENT WITH HOMICIDE PATTERNS: A review of cases involving homicides shows many similarities with patterns in the Cobain case. \n\n6.) OTHER EVIDENCE INDICATES HOMICIDE: Officially acknowledged evidence exists which indicates the possibility of homicide, including a misleading missing persons report, postmortem credit card usage, handwriting discrepancies on the "suicide" note, and the lack of legible fingerprints on the weapon. It appears the police were prejudicially in favour of a suicide ruling, and that the coroner was involved in a conflict of interest predisposing him towards this major discrepancy in the evaluation of his findings. \n\n7.) CONCLUSION: HOMICIDE: The evidence indicates that a massive intravenous dose of heroin, and possibly a benzodiazepine, was administered to Cobain. The final of the two known injections incapacitated and/or killed Cobain, and the gunshot is evidence of a homicide staged to look like a suicide. The case should be re-opened by an independent investigatory body.
523776
Heroin is an illegal, highly addictive drug. It is both the most abused and the most rapidly acting of the opiates. Heroin is processed from morphine, a naturally occurring substance extracted from the seed pod of certain varieties of poppy plants. It is typically sold as a white or brownish powder or as the black sticky substance known on the streets as "black tar heroin." Although purer heroin is becoming more common, most street heroin is "cut" with other drugs or with substances such as sugar, starch, powdered milk, or quinine. Street heroin can also be cut with strychnine or other poisons. Because heroin abusers do not know the actual strength of the drug or its true contents, they are at risk of overdose or death. Heroin also poses special problems because of the transmission of HIV and other diseases that can occur from sharing needles or other injection equipment.
157541
You produce a hormone in your brain that works likes a kinda drug.  Your body can get addicted to it.  Also it is just fun.
178971
a chemical called endorphin that is released into your body via your cells
785367
Drugs are substances that cause a physical or mental change in your body. If they are used therapeutically, they get classed as pharmaceuticals.
1067839
Many estimates are around 5% full recovery. Although it is interesting that in England where they prescribe heroin for certain medical conditions, that they seem to have virtually no problem weaning patients off of it. Perhaps if we used pharmaceutical grade heroin instead of methadone, we might have better results. Recovery from any drug addiction depends on amount, length and frequency of use. The prognosis is always better for people who have not used for more than a year.
691206
Google "myths about heroin".\n\nhttp://www.health.org/multimedia/webcasts/mythfactseries/heroin.aspx\n\nhttp://www.totse.com/en/drugs/miscellaneous_drug_information/167800.html
534519
The main way it affects it is this.  Smoke particles block up the alvioli in the lungs and that is where the exchange of oxygenated and deoxygenated blood cells take place - the more are blocked, the less oxygen can get into the bloodstream and the less oxygen gets to the body's vital organs.  Cigarettes also contains tar which also blocks up the lungs and small traces of arsenic (a poison) which is stored by the body and builds up over a period of time.  As to diseases:\n\nAsthma, Emphysema, permanently stained teeth and fingers, Gingivitis, Gangrene, chronic obstructive pulmonary disease (COPD), acute myeloid leukemia and cancers of the cervix, kidney, pancreas and stomach; abdominal aortic aneurysm, chronic bronchitis, cataracts, periodontitis and pneumonia, colorectal cancer, liver cancer, prostate cancer or erectile disfunction, increased chances of getting breast cancer, cancer of the bladder, eosophagus, larynx, lung, mouth, throat, linked to chronic lung disease, chronic heart and cardiovascular disease as well as reproductive problems. Expect to die 10 to 15 years earlier than non-smokers. \n\nHope that helps.
375268
Methadone is a synthetic version of heroin. You don't have to be any level of "bad" before you can use it. If you are currently addicted to heroin and want to get off it, then you could use methadone. It doesn't matter how much heroin you're using right now, even if you only use a little bit, but can't stop doing it, you could use methadone.\n\nMethadone works in the same way as heroin, it acts on the same receptors in the brain. If you see a doctor who agrees to prescribe you methadone, you would start on a small dose and gradually increase it. You take it every day, usually first thing in the morning, but it's supervised daily consumption for a while to start with, which means you'd have to go to the pharmacy every morning for your dose. Your dose will be adjusted until you're on a dose which gets you through 24 hours without having any withdrawal effects when it's getting close to your next dose, and most importantly, you'll be on a dose which is high enough that you don't get any "hit" if you use heroin on top of it.\n\nMethadone IS addictive, and it's hard to get off in itself. But the advantages of using methadone are HUGE over using heroin. Firstly, methadone is safe. You never know what your heroin might be mixed with. Secondly, you take methadone orally. So you don't have the risks of infection and clots from injecting heroin. Thirdly, think of the money you'll save if you're not buying heroin every day. Fourthly, it's easy to overdose on heroin. You don't know what percentage of your bag is heroin and what is talcum powder etc. You won't be able to overdose on methadone because you only get one day's worth at a time until you're over the worst of it.\n\nI'd strongly recommend methadone if you have a problem with heroin addiction.