Bronchodilator effect of delta1-tetrahydrocannabinol.

Administered in 62 microliter metered volumes containing 50--200 microgram by inhalation from an aerosol device to patients judged to be in a steady state, delta1-trans-tetrahydrocannabinol increased peak expiratory flow rate (PEFR) and forced expiratories volume in 1 second (FEV1).