|"No industry, no sport, can be allowed to develop in a way that will destroy a generation," it said before going on to liken online games to "spiritual opium". (Photo by= Bertha Wang)| [Asia News = Reporter Reakkana] Shares in two of China's biggest online gaming firms have slipped after a state media outlet called them "electronic drugs". BBC reported that Tencent and NetEase shares fell more than 10% in early Hong Kong trade before regaining some of those losses. Investors are increasingly concerned about Beijing cracking down on firms. In recent months authorities have announced a series of measures…