What effect do ventilation holes in cigarettes typically have on smoking behavior?

Ventilation holes in cigarettes are designed to allow air to mix with the smoke as a smoker inhales. This alteration in air-to-smoke ratio can lead to deeper inhalation, which is a common behavior among smokers. When the smoke is diluted with air, it can feel smoother, prompting smokers to take deeper puffs to achieve the desired nicotine effect. These deeper inhalations can increase the intake of harmful substances since the smoker may inhale more smoke and toxins because of the reduced irritation from the cooler, diluted smoke. This underscores how ventilation holes can inadvertently encourage more intensive inhalation habits among smokers.