However, the health effects of second-hand vapour are still unknown
The exclusion criteria included the use of other forms of tobacco, dual users (current, simultaneous use of conventional cigarettes and HTPs products), history of alcohol consumption, participants with a history of upper respiratory infections within the past three weeks, sinonasal disorders (nasal polyps, chronic rhinosinusitis, allergic rhinitis, severe septum deviation), a history of exposure to respiratory toxins other than cigarettes, malignancy, head trauma, neurologic, endocrine, and psychiatric disorders
Key considerations for maximum effectiveness[4] This provision for increasing the minimum age for selling one of these products appears promising as long as it is implemented on the basis of good practices
doi:10.2307/3679392