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The late phase occurs within 30 minutes to four hours

Respiratory irritation and the bronchial constriction from a propylene glycol aerosol raise concerns about harm to people with asthma and chronic obstructive pulmonary disease, but one small study reports no harm but rather benefit when users quit smoking or smoke fewer cigarettes per day." Keep in mind, however, that the research here is still early, and this conclusion on e-cigarettes could change once tens of thousands of people and not just dozens or hundreds have been studied

Research published on NCBI confirms that areca nut (a key ingredient in gutkha) is directly linked to oral fibrosis and increased cancer risk

These hazardous compounds also increase the propensity of a person to become addicted

Asfar, T., Ward, K