| affect central nervous … | 0.46 |
| decrease appetite | 0.41 |
| increase alertness | 0.40 |
| elevate mood | 0.39 |
| increase energy | 0.39 |
| exist as two enantiomers | 0.37 |
| alter brain chemistry | 0.34 |
| encourage aggressive, v… | 0.33 |
| refer to specific chemi… | 0.31 |
| remain unchanged | 0.31 |
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| depression | 0.25 |
| anxiety | 0.20 |
| death | 0.20 |
| confusion | 0.16 |
| hallucination | 0.16 |
| the norepinephrine | 0.16 |
| dopamine | 0.16 |
| insomnia | 0.16 |
| longer duration of acti… | 0.39 |
| high potential | 0.35 |
| larger percentage of th… | 0.29 |
| addictive | 0.59 |
| dangerous | 0.39 |
| toxic | 0.39 |
| potent | 0.36 |
| more dangerous | 0.35 |
| neurotoxic | 0.32 |
| illegal | 0.32 |
| detectable | 0.30 |
| easier | 0.29 |
| excreted unchanged | 0.29 |
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| drug | 0.41 |
| synthetic drug | 0.25 |
| produced | 0.61 |
| smoked | 0.52 |
| produced in mexico | 0.47 |
| used as recreational dr… | 0.44 |
| abused | 0.44 |
| discovered in 1893 | 0.43 |
| developed in japan | 0.41 |
| developed in 1919 | 0.39 |
| packaged for sale | 0.36 |
| swallowed | 0.36 |
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| amphetamine | 0.38 |