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The airflow is adjustable

This can vary, and some people might continue to experience withdrawal symptoms for several months, particularly those who have used nicotine products heavily for several years

Thats as it should be

The researchers categorized participants into 6 groups according to their smoking history and habit change to e-cigarette use as follows: People who quit smoking conventional cigarettes at least 5 years prior without e-cigarette use People who quit smoking conventional cigarettes less than 5 years prior without e-cigarette use People who currently smoke conventional cigarettes without e-cigarette use People who quit smoking conventional cigarettes at least 5 years prior with e-cigarette use People who quit smoking conventional cigarettes less than 5 years prior with e-cigarette use People who currently smoke conventional cigarettes with e-cigarette use The researchers assessed the risk of lung cancer and lung cancer-specific death using Cox proportional hazards models with adjustments for potential confounders