Feedback on film pitch

Today we pitched our ideas to our fellow peer's and we received very good feedback although there was one thought which was to our film certificate. They believed that our film was not a 15 but an 18 as it contained taking drugs. However we researched this as we thought that our film was in the 15 category.
After doing some research about what is allowed in 15 and 18 films
We found this that a 15 allows : 'Drug taking may be shown but the film as a whole must not promote or encourage drug misuse.'
This means that fortunately our film would be accepted as the main message of the film is not to take drugs. This was important as if it was an 18 rated film and a teen drama it would have a very limited target audience.