Members of the association also expressed concern about the prevalence of crack, a highly concentrated, extremely addictive form of cocaine, among high school students.

"It's the most highly addictive form of gambling."

More inner-city women may be selling sexual favors for drugs, especially crack, a highly addictive form of cocaine, they said.

The reality that the most highly addictive form of cocaine, crack, is now poisoning children as young as 9 and 10 may move us.

The authorities are particularly concerned about cocaine because of its devastating effect on society, particularly in the cheaper, highly addictive form of crack.

Six million use cocaine, and the use of crack, a highly addictive form of cocaine, has reached epidemic proportions in the last two years.

Flight simulators are among the most popular and addictive forms of computer games, if games they are.

Crack cocaine is popularly thought to be the most addictive form of cocaine.

But in recent months there have been more and more users of crack, the smokable and most addictive form of cocaine.

Instead they are targeting only the newest and most addictive form of American betting: "convenience gambling."