I remember how challenging the Access course was, we had 12-14 assignments/exams per term!
You could look on the government statistics website and mention some stats of how many people are affected by passive smoking and use this as part of the introduction, as to why people wanted it banned. Also, look at the stats of how it has affected pub business and look at how profits have been affected etc.
Hope that helps a little. Getting your first essay out the way is the most daunting. Maybe you could write out some bullet points, then make an appointment for a tutorial to check you are going in the right direction?
My tutors were so supportive and really did want their students to do well. A far cry from my life at uni!
Best of luck!