'I wouldn't say I smoke puff very regularly, just about once a fortnight at parties. Now I've stopped doing aerosols because it really messed me up.
Basically, I was depressed, had nothing to do, with nowhere to go and it took up my time.'
Now Chelsea - not her real name - is determined to 'stick to cannabis', saying: 'It's just something to do with my mates and I like it.' She refuses drugs like ecstasy and speed 'because they're dangerous'.
She gets most of her cannabis from a friend and 'occasionally my uncle gives some to me because he has a few plants'. Her parents are divorced. Her two brothers live with her mother. She lives with her father. He once took cocaine but Chelsea said: 'I don't want to give the impression he was a druggie - he was just going through a divorce and was really messed up at the time'.
Chelsea says cannabis is relatively simple to buy. 'It's only a phone call away. It's cheap, lasts a long time and it's better than being drunk. When you're drunk you're out of control, but being stoned you're in control and you can be yourself and have a laugh.'
She has no plans to give up. 'Maybe in a few years . . . but at the moment, I like it and I will carry on.'