Update to study advert: male participants needed UCL researchers are looking for male staff and students, who smoke cigarettes every day, to take part in a study at UCL investigating the effects of Cannabidiol (CBD) on nicotine withdrawal.

This study involves three sessions in total. The first session will involve you smoking as normal and is due to take 90 minutes. The second and third sessions are scheduled to take four hours (approx.) where you will be asked not to smoke for 12 hours before each session. In these sessions you will be given either CBD or placebo across the two weeks. Sessions will take place on a weekday morning therefore we are looking for people with flexibility in their schedules.

Participants must be London-based, in good physical and mental health and able to pass a drug test on each day.

Participants will be paid more than £100 in cash at the final session of the study and will also leave with the knowledge that they have contributed to UCL researchers' understanding of how we can modulate the endocannabinoid system to help cigarette smokers.

Participation is completely confidential and you are free to withdraw at any time.

If you would like to take part, please email smokingstudy2017@gmail.com​ outlining the number of cigarettes you smoke on a daily basis, and researchers will set up a screening call.

This study is being carried out at University College London and has full ethical approval (ref: 7725-002).

Chandni Hindocha, PhD student, Clinical Psychopharmacology Unit