The goal of this clinical trial is to learn how waterpipe (WP) size affects smoking behavior, toxicant exposure, and subjective experiences in young adult WP smokers (ages 21-39). The main questions it aims to answer are: * Does WP size change puffing behavior? * Does WP size change exposure to nicotine and carbon monoxide? * Does WP size change perceptions of harm, satisfaction, craving, or withdrawal? Participants will smoke small, medium, and large WPs in separate sessions. Researchers will measure puffing behavior, saliva nicotine, exhaled carbon monoxide, and survey responses before and after each session.
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Waterpipe Evaluation Scale
Timeframe: Immediately after the exposure (smoking)
Duke Sensory Questionnaire
Timeframe: Immediately after the exposure (smoking)
Harm Perception Questionnaire
Timeframe: Immediately after the exposure (smoking)
Saliva Nicotine
Timeframe: Immediately after the exposure (smoking)
Puff Topography: Smoking Time
Timeframe: During the exposure (smoking), up to 45 mins
Puff Topography: Cumulative Puff Time
Timeframe: During the exposure (smoking), up to 45 mins
Puff Topography: Puff Duration
Timeframe: During the exposure (smoking), up to 45 mins
Puff Topography: Average Flow Rate
Timeframe: During the exposure (smoking), up to 45 mins
Puff Topography: Number of Puffs
Timeframe: During the exposure (smoking), up to 45 mins
Puff Topography: Total Smoke Volume Inhaled
Timeframe: During the exposure (smoking), up to 45 mins
Puff Topography: Puff Volume Average
Timeframe: During the exposure (smoking), up to 45 mins
Puff Topography: Maximum Puff Volume
Timeframe: During the exposure (smoking), up to 45 mins