From the medical aspect we have found no direct research of any harmful effect from smoking salvia. This does not mean salvia smokers have not gained injury from the effects of being high on salvia after smoked so in a wide perspective can we say that some have been injured under the influence of the herb, well we would be lying if we said no since one can be injured on taking heavy cough medication because that also impairs your judgment.
Most likely you already know some or many people who smoke or have smoked salvia or at lest tried salvia in the last 5 years. As this herb becomes more common its going to undoubtedly become a regular smokers pass time and although we do not support smoking salvia, Frankly this is just what some people will do regardless of what laws may be in place to stop this from happening.
