Tobacco smoke has many effects on those breathing it, including: Inflammation of the airways, causing them to narrow Increased mucus production Damage to cilia, allowing mucus to clog airways and worsen symptoms Decreased lung function Severe symptoms, which may trigger asthma attacks What about allergies and secondhand smoke
Thats because even though teenagers under age 18 already werent allowed to purchase tobacco products, raising the age minimum will restrict the number of family members and friends who can buy cigarettes for them
However, this may not be financially or logistically possible in some situations
Per UpToDate, the recent (2016) EAGLES trial demonstrated that in contrast to earlier concerns, varenicline and bupropion have no higher risk of associated adverse psychiatric effects than [nicotine replacement therapy] in smokers with comorbid psychiatric disorders. Further Reading/References : 1
King Size Box Tar 4 mg, Nicotine 0.4 mg Each carton contains 10 packs of 20 cigarettes 1 carton contains 200 cigarettes All prices are listed in USD