soft drug

drug not likely to cause addiction (eg marijuana) and less dangerous than a hard drug such as heroin 软性毒品（不易使人上瘾且危害性不及海洛因之类的硬性毒品者, 如大麻）.

sociology, sociopath, sock, socket, sod, soda, soda siphon, soda-fountain, soda-water, sodden, sodding, sodium, sodium carbonate (also `washing soda), sodium chloride, sodium hydroxide (also ,caustic `soda), sodomite, sodomy, sofa, soft, soft currency, soft fruit, soft landing, soft option, soft palate, soft porn, soft shoulder, soft soap, soft-boiled, soft-drink, soft-hearted, soft-heartedness, soft-pedal, soft-soap, soft-spoken, softball, soften, softener, softish, softly, softness,