نبذة مختصرة : Background For the first time, the present study investigated smoking trajectory and cardiometabolic profile from adolescence to young adulthood in a middle‐income developing country facing a high prevalence of smoking and cardiovascular disease‐related outcomes. Methods and Results Data on 1082 adolescents (12–18 years of age) who participated in the TLGS (Tehran Lipid and Glucose Study) were gathered, and participants were followed for a median of 12.5 years (baseline: 1999–2002, last follow‐up: 2014–2017). Participants were categorized as non/rare smokers, experimenters, and escalators using group‐based trajectory models. Statistical analysis was used to compare the trajectory groups' cardiometabolic components, clinical characteristics, and cardiometabolic changes due to the individuals' placement in experimenter and escalator groups compared with non/rare smokers. The smoking trajectory groups in young adulthood differ significantly in blood pressure, triglycerides, high‐density lipoprotein cholesterol, waist circumference, and body mass index, with the escalator group having the highest risk values for each component. Significant differences were observed in blood pressure (P=0.014), triglycerides (P
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