Smoking - Online Survey

I've decided to do an online survey for some primary research to work with. I think by doing this it will help me to understand better how smokers really think and what not right now, and not just judging it on existing facts and figures. I will ask...

• Are you a smoker?
• At what age did you start smoking?
• What was your reasoning for starting?
• Have you ever tried to quit?
• What would be your biggest incentive to quit?
• How many cigarettes do you roughly smoke a day?

I'm keeping it to just the 6 simple questions as no one likes to be bogged down with long survey questions. I think by asking these questions it will help to inform decisions that I will make with the progress of this brief.