Cocaine is a powerfully addictive drug. Users become ____  to it easily if they smoke it because smoking____ （allow) cocaine to reach the brain very____ (quick).

        Users who inject the drug are also in more danger if they share needles ____ other users. ____  (use) cocaine increases the user’s heart rate and blood____ (press).

         As____  result, cocaine users sometimes have heart____ (attack),____ also causes anti-social ____  (behave).