I am wanting to quite smoking and bought an e-cigarette yesterday. I was given the 15ml bottle of 15mg nicotine (Lush, Simply Menthol). Right away I started with headaches and the inside of my mouth is irritated. I normally smoke between 10 and 13 cigarettes a day. Is the 15mg too strong for me? I usually light a cigarette and take a few puffs and then put it in a snuffer. Then I go back and take a few more puffs, etc. Since I'm not getting as much nicotine only smoking 10 to 13 cigarettes a day, I am worried that I could be getting way too much nicotine from the e-cigarette. Any input would be appreciated. I am currently still smoking real cigarettes a little (puff here and there).