Why difficult to stop

The reason is because there's a chemical substantial called nicotin inside the cigarretes. Nicotine energizes the systema nervosum centrale, increasing the body's pulse rate, blood pressure level and metabolic process. When you consider a cigaret, you will know the consequences of nicotine in under eight seconds. Nicotine is one of the fastest-acting envenoms there is. When breathed in, it also briefly brings out the body from craving, while reinforcing the need to smoke. Every cigarette smoked reinforces the lusting for the next one. It's a vicious cycle, but it can be crushed. I have added this posting with video about NICOTINE and the other lethal chemicals inside. Check it.