are tobacco leaves harmful Warning: Homegrown Still Deadly Tobacco allergy: Symptoms, diagnosis, and

10.1007/s00380-011-0214-5 186

Enhanced Healing and Reduced Complications When nicotine is eliminated, healing accelerates

Lewis R, Parker R, Danehower D, Andres K, Jack A, Whitley D, Bush L (2012) Impact of alleles at the Yellow Burley (Yb) loci and nitrogen fertilization rate on nitrogen utilization efficiency and tobacco-specific nitrosamine (TSNA) formation in air-cured tobacco

In fact, people inhale more nicotine via e-cigarettes than they would from a tobacco product they can buy extra-strength cartridges which have a higher concentration of nicotine, or increase the e-cigarette's voltage to get a greater hit of nicotine, which research suggests may be as addictive as heroin