What percentage of people who smoke tobacco become addicted?

• A. 50%
• B. 30%
• C. 70%
• D. 90%

Answer: (C)

Nicotine is highly addictive, so a large majority of people who smoke become dependent. When tobacco is used, nicotine quickly reaches the brain and strongly activates the dopamine system, producing rewarding feelings. With repeated exposure, the brain adapts, leading to tolerance and withdrawal symptoms when not using nicotine. This combination of rapid delivery to the brain and neuroadaptation makes it easy for regular smokers to develop dependence.

A commonly cited estimate is that about seven in ten people who smoke become addicted to nicotine. This figure captures the strong addiction potential of tobacco and why quitting can be very challenging for many smokers. While exact percentages can vary depending on how dependence is defined and the population studied, 70% is a widely used and useful benchmark. Other numbers like 50% or 30% would understate the risk, and 90% would overstate it.