   “Nicotine of 400 cigarettes.”I used to smoke Winfield Red, 16mg of nicotine per cigarette.16 x 400 = 6,400 mg nicotine.I vape 35mg/ml nicotine, my 7 ml vape has 245 mg nicotine equivalent to 15 cigarettes, my 10 ml vape has 350 mg of nicotine  equivalent to 22 cigarettes.