Study of the Relationship Between Dose-concentration-effect of Delta-9-tetrahydrocannabinol (THC) and the Ability to Drive in Chronic or Occasional Cannabis Users

"Smoked THC containing cigarettes. Randomly allocated dosage 30mg, 10mg et placebo.~Both chronic and occasional cannabis consuming volunteers will be allocated to smoking a cigarette containing (1) no THC (placebo), (2) a joint containing 1% THC (10 mg THC, i.e. low-dose) and (3) a joint containing 3% (30 mg THC) mixed with 1 g tobacco.~Each cigarette will be followed by 24 hours testing in laboratory conditions. Each period is separated by 7 days (3 testing periods over 3 weeks). Each volunteer will undergo performance testing (driving simulator and PVT) before administration of the substance (T0).~Blood samples and repeat performance testing will be carried out at 1 hour, 2 hours, 4 hours, 6 hours, 8 hours, 12 hours and 24 hours."