Cigarettes can actually heighten your stress level. When you smoke, the chemicals that you inhale act as stimulants for your body. Your heart rate, blood pressure, and hormone levels increase. The cost of cigarettes and the diseases which they can cause might also add to your level of stress. Although trying to quit smoking can be stressful in itself, it can often result in an overall reduction in stress levels in the long run.
Caffeine can be very damaging, especially if it is consumed in large quantities.
It can speed up your system for up to 20 hours. Although it might relieve headaches in some people, it can cause them in others. It can also cause sleeplessness and stomach upset. Caffeine is a drug, and you can become addicted to it. Withdrawal symptoms include headaches, nervousness, grouchiness, and a rapid heartbeat.