Technically, nicotine is not significantly addictive, as nicotine administered alone does not produce significant reinforcing properties. However, only after coadministration with an MAOI, such as those found in tobacco, nicotine produces significant behavioral sensitization, a measure of addiction potential. This is similar in effect to amphetamine.
Modern research shows that nicotine acts on the brain to [...]

It is amazing the fact that no matter how much you are trying to convince people that all the addictive drugs ruin their health, they keep abusing them. Alcohol and tobacco, not to mention other recreational drugs like marijuana, heroin, cocaine, even those with medical prescription, are still used by a high percent of the [...]

Methamphetamine is the second drug used most frequently after alcohol and marijuana combined, a highly addictive drug with potent central nervous system stimulant properties. The methamphetamine pharmaceutical products were available  in ’60s. It was forbidden in 1971.
However, illegal, in the ’80s methamphetamine took back it’s place and it is currently considered a major drug of [...]

It covers the chemical process of drugs and alcohol addiction.