Using some substances in moderation will not have harmful effects; however, when too much is used for prolonged periods, health risks increase. I.e, drinking one cup of coffee or tea per day does not pose a health risk, but intaking four to five cups per day can cause a person to have increased heart rate and blood pressure. As well, develop anxiety and hyperactivity.
Tobacco: People spend their money, time and health on smoking tobacco. Nictotine is the drug largely responsible for the addictive characteristic of cigarette smoking and the harmful short-term effects, such as:increased heart rate and blood pressure, decreased urine production, decreased appetite and increased stomach acid production) that smokers experience.
Other substances that can lead to destructive lifestyle include; alcohol, marijuana, steroids, etc.
