Cigarette smokers who also smoke cannabis have an even greater risk of respiratory disease. Many regular users, especially young people, have reported that they have less energy and motivation so that performance at work or school suffers. Usually these effects disappear gradually when cannabis use stops. Concentration, memory and the ability to learn can all be reduced by regular cannabis use. These effects can last for several months after ceasing cannabis use.
Cannabis can affect hormone production.
Research shows that some cannabis users have a lower sex drive. Irregular menstrual cycles and lowered sperm counts have also been reported. This can last up to a few days. The episodes are often characterised by hallucinations, delusions, memory loss and confusion. In some cases, cannabis use may precipitate a latent psychosis.