The cycle of nicotine

Do you know what happens when you inhale nicotine from a cigarette/e-cigarette?
1. Nicotine is inhaled and drawn into the lungs
2. Rapid delivery of nicotine to the brain
3. High nicotine levels create "buzz" 
4. Nicotine levels drop, creating cravings
5. Cravings cause nicotine addiction 

Nicotine enters the lungs and in less than 1 seconds nit hits the brain, releasing a 'feel good' hormone called Dopamine. Dopamine is a normal chemical message that is released anytime we eat, drink or exercise. That's how we know we need food and water to survive without anyone having to teach us.
Anyway! Nicotine like other drugs act as a stimulant. It tricks your brain into thinking it needs this substance to survive (like food and water!) So, when the brain releases dopamine that is what gives off the "buzz" you may feel. Unfortunately, after a few hours when your nicotine levels begin to drop you will start to experience cravings and withdraw symptoms that may include dizziness, headaches, trouble concentrating, irritability, fatigue, nausea, and trouble sleeping. Some people associate these symptoms as stress, but in all reality, its actually the withdrawal symptoms kicking in and the person is going to want their next hit of nicotine. 
One of the side effects of inhaling nicotine is a rapid and increased heart rate and blood pressure, so if you truly are relaxed like the nicotine is tricking your brain into thinking, then should you really have an increased heart rate and high blood pressure? Definitely not!