Why are you only recruiting males/non-smokers/etc?
Each clinical trial has different eligibility requirements depending on a range of factors including: previous trials carried out and their data, sponsor requirements, participant safety and so on. These criteria are put in place to make sure the data collected in a study is relevant and builds on previous research, and not for the purpose of restricting certain demographics from participating.
You can compare our current trials and apply for any that suit you, here or you can register to our mailing list and be the first to know about new trials, here.