You can't just tack a comparative number on vaping vs smoking. Yes, you can compare the actual nicotine content, but you'd have to take the many factors that are involved with smoking typical tobacco you'd buy. There are MAOI's and freebasing agents involved with most tobacco, and there are many other chemicals that play similar roles. To be satisfied at first by vaping, you're more than likely going to have a higher nicotine intake than you did while smoking.