Why is it so hard to quit smoking?
A study has found that 43% of women who give up smoking during pregnancy take it up again soon after they give birth. Why so many? Its no surprise that nicotine is addictive, but what goes on in the brain during a cigarette craving?
Nicotine is picked up in the brain by nicotinic receptors. We also have cannabinoid and opioid receptors which work in similar ways - there are no prizes for guessing what they pick up. These receptors didnt evolve for humans to become addicted to drugs, but they happen to provide a more direct pathway for these plant-based chemicals to reach the brain. Over time, smokers adapt to the presence of nicotine and develop a tolerance, leading to cravings.
This means that nicotine addiction develops in a more fundamental, chemical way than addictions to sex, the internet or even chocolate. There are no internetinoid or chocolatinoid receptors in the brain - instead, dependencies develop through more indirect pathways related to reward and pleasure.
Not everyone who smokes becomes addicted, but as the women in the study will tell you, this chemical hardwiring makes it very difficult to quit.
