The high from Sour Diesel comes on users quickly in the form of a warm and pleasant head rush. An uplift in mood may be noticeable as well. Although Sour Diesel stimulates synaptic activity in the brain, the character of this head high is more spacey than intensely cerebral. For many, this soaring high is partially anchored by a slight feeling of physical relaxation, but a full-on couch lock is rare.