1. There are at least 250 toxic chemicals in cigarette smoke.
There are 4,000 chemicals in tobacco smoke and at least 250 are known to be harmful.
Source: National Cancer Institute
2. There is a relationship between tobacco use and decreased bone density, increasing your risk of broken bones.
Smoking increases your risk of suffering a broken bone. Smoking may be a risk factor for osteoporosis, possibly because it makes it harder for the body to absorb and use calcium.
Source: National Institute of Arthritis and Musculoskeletal and Skin Diseases
3. People who smoke cigarettes are more likely to have a heart attack.
People who smoke cigarettes are more than six times more likely to have a heart attack than nonsmokers, and your risk of heart attack goes up with every cigarette smoked.
Source: National Heart, Lung and Blood Institute 
4. Cigarette smoking is linked to blindness.
Smoking cigarettes increases your risk of macular degeneration, which is the most common cause of blindness in the United States and the world.
Source: Department of Health and Human Services
5. Cigarette smoke is the cause of almost 30% of all lung cancer cases.
Cigarette smoke causes more than 85% of all lung cancer cases. More than 115,000 American smokers die of lung cancer every year.
Source: Centers for Disease Control and Prevention
6. Approximately 200,000 Americans are killed each year by sickness related to smoking.
Try twice as many. Approximately 400,000 American deaths each year are related to smoking.
7. Someone who smokes a pack of cigarettes a day could save about $100 per year by quitting.
The savings can be much higher than that. Based on the average cost of $5 per pack, someone who smokes a pack of cigarettes a day would save $1,825 in just one year.
8. Many cigarette smokers quit the habit successfully after their first try.
Most smokers don?t quit successfully on their first try. Don?t be discouraged if you have not been able to quit. Try again using a different method and a support system!
9. Lung cancer is the only cancer caused by smoking cigarettes.
Smoking cigarettes can cause cancer in almost every part of your body, including your throat, esophagus, bladder, cervix, kidney, or stomach.
Source: Centers for Disease Control and Prevention
10. Only one out of four people who smoke cigarettes begins the habit before the age of 21.
Actually, it?s more than that! Most cigarette smokers begin the habit before the age of 21.
Source: Centers for Disease Control and Prevention
11. Each day, more than 3,000 children younger than age 18 begin smoking cigarettes.
Every day, about 3,600 children younger than age 18 try their first cigarette, and more than 1,200 of them will become new, regular daily smokers. Half of them could die from their habit.
Source: Centers for Disease Control and Prevention
12. Secondhand smoke causes 5,000 deaths each year.
Nearly 50,000 Americans die each year from secondhand smoke. Secondhand smoke is a major cause of heart problems, including heart attacks. Any amount of secondhand smoke is harmful.
Source: Centers For Disease Control and Prevention
13. Cigars do not cause your body the same problems as cigarettes.
Cigar smoking causes your body similar problems as cigarette smoking. Cancers of the lung, mouth, and esophagus are caused by regular cigar smoking.
13. Cigars do not cause your body the same problems as cigarettes.
Almost 2 out of every 10 12th graders in the United States use marijuana each month.
Source: National Institute on Drug Abuse
14. Only about 1 out of every 100 12th graders in the United States has used marijuana in the past 30 days.
Almost 2 out of every 10 12th graders in the United States use marijuana each month.
Source: National Institute on Drug Abuse
15. Smoking marijuana increases your heart rate.
Your heart rate, which is normally 70 to 80 beats per minute, may increase by 20 to 50 beats per minute after smoking marijuana.
Source: National Institute on Drug Abuse
16. The effects of ecstasy on the brain never last.
We still don?t know whether ecstasy, also known as MDMA, causes long-term brain damage or whether the effects are completely reversible when someone stops using the drug.
Source: National Institute on Drug Abuse
17. Ecstasy is never addictive.
Like other drugs, ecstasy, also known as MDMA, can be addictive for some people. No one knows how many times a person can use a drug before becoming addicted or who's most likely to become addicted. A person?s genes and their environment may play a role in whether they are likely to become addicted to ecstasy.
Source: National Institute on Drug Abuse
18. Ecstasy can cause confusion, depression, sleep problems, intense fear, and anxiety.
Like other drugs, ecstasy, also known as MDMA, can be addictive for some people. No one knows how many times a person can use a drug before becoming addicted or who's most likely to become addicted. A person?s genes and their environment may play a role in whether they are likely to become addicted to ecstasy.
Source: National Institute on Drug Abuse
19. Ecstasy can cause high body temperature (hyperthermia).
Ecstasy, also known as MDMA, makes it harder for the body to control its temperature, which can cause dangerous overheating, called hyperthermia. This can lead to serious heart and kidney problems?or, rarely, death.
Source: National Institute on Drug Abuse
20. Ecstasy can cause memory loss.
Regular users of ecstasy, also known as MDMA, have had memory loss.
Source: National Institute on Drug Abuse
21. Heroin abuse is linked to overdose.
Heroin abuse is linked to serious health conditions, including overdose and death. Users who inject the drug are more likely to get infectious diseases, including HIV/AIDS and hepatitis.
Source: National Institute on Drug Abuse
22. Using street heroin can cause permanent damage to the brain.
Street heroin can contain toxic additives that can clog blood vessels leading to the lungs, liver, kidneys, or brain, causing permanent damage to these organs.
Source: National Institute on Drug Abuse
23. There is no treatment once someone is addicted to heroin.
There are many different treatments for heroin addiction, including medications, counseling, and supportive services. People often use more than one at the same time.
Source: National Institute on Drug Abuse
24. If a person is addicted to heroin and just stops using, there usually aren?t any problems.
When a person quits heroin, they may have restlessness, muscle and bone pain, trouble sleeping, diarrhea, vomiting, cold flashes with goose bumps ('cold turkey'), kicking movements ('kicking the habit'), and other problems.
Source: National Institute on Drug Abuse
25. Using cocaine makes you feel hungry.
Cocaine can decrease appetite, and regular users may not eat enough to keep their body healthy.
Source: National Institute on Drug Abuse
26. There are no medications for treating cocaine addiction.
Researchers are looking for medications that can help people who are addicted to cocaine stop and not start again.
Source: National Institute on Drug Abuse
27. Cocaine can cause heart and breathing problems.
Cocaine can cause heart attacks, lung failure, strokes, and seizures. Large amounts of cocaine can cause strange and violent behavior. Rarely, cocaine can cause sudden death after using it for the first time.
Source: National Institute on Drug Abuse
28. Cocaine use is easy to manage.
Cocaine is a very addictive drug. A person may have a hard time controlling the urge to use the drug. People who use cocaine for a long time can have problems with addiction, irritability, restlessness, intense fear, and hallucinations.
Source: National Institute on Drug Abuse
29. Drinking too much alcohol can increase your risk of developing certain cancers.
Drinking too much alcohol can increase your risk of developing certain cancers, including cancers of the mouth, esophagus, throat, liver, and breast.
Source: National Institute on Drug Abuse
30. Drinking too much has no effect on your immune system.
Drinking too much alcohol can weaken your immune system, making your body a much easier target for disease. Chronic drinkers are more likely to contract diseases like pneumonia and tuberculosis than people who do not drink too much. Drinking a lot on a single occasion slows your body?s ability to ward off infections?even up to 24 hours after getting drunk.
Source: National Institute on Drug Abuse
31. Alcohol can disrupt fetal development at any stage during a pregnancy.
Drinking during pregnancy can cause brain damage, leading to a range of developmental, cognitive, and behavioral problems, which can appear at any time during childhood.
Source: National Institute on Drug Abuse