Thirty-one American soldiers who smoked enormous quantities of illicit hashish for several months temporally related a number of medical effects to their habit. Their ailments were principally respiratory and included bronchitis, sinusitis, asthma, and rhinopharyngitis. Irritation of the respiratory tract by hashish smoke appeared to be responsible. Uvular edema is reported as a useful physical sign in the evaluation of the suspected user of hashish.
Tennant FS, Preble M, Prendergast TJ, Ventry P. Medical Manifestations Associated With Hashish. JAMA. 1971;216(12):1965-1969. doi:10.1001/jama.1971.03180380023004