Other subjects explored include hydrogen bonding effects on the photochemistry of chromophores in solution, photochemical generation of silicon-centered radicals and their reactions, and photochemical processes at the air-water interface of atmospheric droplets.
Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class of psychoactive drugs. It is the world's most widely consumed psychoactive drug, but unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world.
DEA. The U.S. Drug Enforcement Administration lists marijuana in the most restrictive of five classes that the agency uses to regulate dangerous drugs. Marijuana is classified as a Schedule I substance, which is the ranking reserved for drugs with the greatest potential for abuse and with no medicinal value.Heroin, ecstasy and LSD are listed in that category, too, while cocaine and methamphetamine rank one level lower than marijuana, as Schedule II.arijuana has been classified as a Schedule I drug, the highest rank by the Drug Enforcement Administration, since the 1970s. Marijuana's listing among the most dangerous drugs has been heavily influenced over the years by politics and public opinion, while advocacy groups have been working to change it for decades.