"Some people believe that students can make their own decision because they are grown up and they can make their own decision. Others disagree. Do you think that smoking should be forbidden at educational contexts?"
I think so. The main reason is the students' health. Can you give me two more reasons?] Need now Thank you :))~
Are you using your reason to point out the health of the students who smoke, or the ones that inhale second-hand smoke? If it's just for the ones who smoke, than you can use the effect smoking has on students that don't smoke, but end up inhaling second-hand smoke. Another point that you can make is the damage that it does to the environment around the students, or you could write about how the cost of cigarettes deprives students of essential funds that they could have used for something that they actually need.