Legal highs are intoxicating drugs used by people, not prohibited by the United Nations Single Convention on Narcotic Drugs. Legal highs are classified into different categories like, stimulants which includes caffeine, nicotine etc. Hallucinogens, includes salvia divinorum, nutmeg, tlitlitzin, ergot, toad, synthetic cannabinoids etc. Deliriants, includes datura and diphenhydramine. Depressants, includes alcohol, kava, and diethyl ether. Inhalants, includes nitrous oxide and nitrites. Opiods (codeine with paracetmol) and Kratom (used mainly in South East Asian countries for sedative use, even though they are legally banned.). Recently, it was found that most of the second-generation legal highs are cathinone-based. The U.K. Government banned them in 2010 by classifying these derivatives like mephedron under Class B, Schedule I drugs. Some products reappeared with dimethocaine as ingredient and NRG-1 with naphyrone. Test results showed that these products were either in the form of powders, crystals, dark oil, and green granules, supposed to contain naphyrone were proven false. Out of 13 samples, only one did. The rest contained cathinone as sole ingredient or in mixtures of mephedrond, butylone, caffeine and other local anesthetics. In the United States, following types of legal highs (drugs) are legal to possess/consume. Kratom, for anxiety, depression, and pain. Kava, for anxiety, phobia, and insomnia. Betel Nut reduces appetite, acts as a stimulant for a sense of well being. Wormwood, for mild high when mixed with marijuana. Hawaiian Baby Woodrose, for psychedelic effect. Salvia, for short-term hallucinations. Ayahuasa, for peak effects, which could last from 2 to 6 hours. Trichocereus Cacti, for mescaline and not addictive.