Pot for asthma

Medical reseach done in 1975 shows that pot can be valuable for asthma.

Instapundit suggests that in case of clogged lungs caused by the H5N1 flu virus, inhaled steroids such as those used for asthma might be helpful.

Pot seems to do the job and is much safer. Especially in the case of children, why would we even consider dangerous drugs like steroids?