Marijuana is the illicit drug most frequently found in the blood of drivers who have been involved in vehicle crashes, including fatal ones. 10 Two large European studies found that drivers with THC in their blood were roughly twice as likely to be culpable for a fatal crash than drivers who had not used drugs or alcohol. 11 , 12 However, the role played by marijuana in crashes is often unclear because it can be detected in body fluids for days or even weeks after intoxication and because people frequently combine it with alcohol. Those involved in vehicle crashes with THC in their blood, particularly higher levels, are three to seven times more likely to be responsible for the incident than drivers who had not used drugs or alcohol. The risk associated with marijuana in combination with alcohol appears to be greater than that for either drug by itself. 8
Other complications are caused by the incomplete healing of the damage to the facial nerve. 20% of patients with Bell's palsy will go on to experience long-term effects of the condition. This is more likely to occur in patients who experienced complete paralysis on one side, have high blood pressure, diabetes, or are over 60. Residual nerve damage can cause these patients to experience permanent facial weakness, speech problems, facial tightness, and other ongoing symptoms. Some of these complications may be treated with physiotherapy or surgery to improve cosmetic appearance and function, and Botox injections are used to alleviate facial tightness.
Scientists have attempted to test the association between anabolic steroids and aggression by administering high steroid doses or placebo for days or weeks to human volunteers and then asking the people to report on their behavioral symptoms. To date, four such studies have been conducted. In three, high steroid doses did produce greater feelings of irritability and aggression than did placebo, although the effects appear to be highly variable across individuals. In one study, the drugs did not have that effect. One possible explanation, according to the researchers, is that some but not all anabolic steroids increase irritability and aggression. Recent animal studies show an increase in aggression after steroid administration.