My mom says I can't write an article about cannabis?

Hey so I'm doing my first year of the GCSE course in the UK and we have to do controlled essment it's like coursework. Well for English we have to write a rant newspaper article about something that really annoys me. I decided to do the legalisation of cannabis I told my mom before hand she didn't seem keen but I really wanted to do it so last weekend I wrote it up I read it to my dad he said it's good then I read it to my mom and she stopped me half way at a bit where I said that cannabis is phycologocaly addictive like the addiction to tea but not physically addictive like heroin she got angry and said I was wring and that i take things from the Internet and ume them to be facts I took it to cl today my teacher said it is okay to write about I spent about two hours on the article btw and I got home today when my mum came bak she said what homework have you done I said English I was rearranging my article and fixing some errors ( this is true btw) she took my to my room and said that cannabis is bad for you and that she is not going to let me write it and she will phone the school to stop me from writing it. I have to give in my final copy in two days if she phones my school I will have to stay after school to write the article on a whole new subject.yeah here's the great but my mom us a doctor so she thinks she is always right she doesn't accept my sources as real I just feel like if I have to stay after school I will end up rushing it and handing in a poor essay and this is for my GCSE's some how my mom can only talk to me for 5 minutes but screw up a week for me pls give me you honest thoughts even if that means I'm wrong I have tried to make this as non-biased as possible thank you