I found the info below on Wikipedia. Its about smoking methaqualone pills. Apparaently its known to be a serious health risk. Not sure if the same issues will necessarily apply to etaqualone, but i guess there's at least a chance that they will.
Smoking methaqualone, either by itself or as an adulterant added to various legal and illegal smoking mixtures, gained popularity in the U.S. among a few during the mid-1970s. Because the various binders and inert ingredients that were contained in the pill form were toxic when smoked, this practice was roundly decried by the medical community as a serious health risk. Smoking methaqualone pills can lead to emphysema and other chronic lung disorders, most notably talcosis.