A survey of B.C. teens suggests fewer are using marijuana but more are abusing prescription and hallucinogenic drugs such as ecstasy.

The study by the McCreary Centre Society suggests pot smoking among teens has fallen for the 10th year in a row -- down to 30 per cent from 37 per cent in 2003.

But according to the survey of 29,000 students, there's been a six per cent jump in adolescents trying prescription drugs without a doctor's supervision and a nine per cent increase in use of hallucinogens since 2003.

Executive director Annie Smith says the survey of Grades seven to 12 students doesn't explain why more are abusing prescription drugs and hallucinogens.

She says recent studies in other provinces have found a similar trend and the society will explore that further in future workshops with teens.

The 2008 survey of physical and emotional health also suggests that the majority of B.C. youth are in good health, feel connected to their family, school and community and are smoking and drinking less than teens in 2003.