Although the use of cannabis is not harmless, the current knowledge base does not support the assertion that it has any notable adverse public health impact in relation to mortality. Common sense should dictate a variety of measures to minimise adverse effects of cannabis. These include discouraging the use by teenagers, who seem to be most at risk of future problems from drug use,12 not using before or during the operation of automobiles or machinery, not using excessively, and cautioning in people with known coronary heart disease.
