这个可以讲

Drug addiction symptoms or behaviors include, among others:

• Feeling that you have to use the drug regularly — this can be daily or even several times a day
• Having intense urges for the drug
• Over time, needing more of the drug to get the same effect
• Making certain that you maintain a supply of the drug
• Spending money on the drug, even though you can't afford it
• Not meeting obligations and work responsibilities, or cutting back on social or recreational activities because of drug use
• Doing things to get the drug that you normally wouldn't do, such as stealing
• Driving or doing other risky activities when you're under the influence of the drug
• Focusing more and more time and energy on getting and using the drug
• Failing in your attempts to stop using the drug
• Experiencing withdrawal symptoms when you attempt to stop taking the drug

所有跟帖： 

• 吃了总是有快感才会上瘾啊。比如可卡因等，吃了飘飘然的。吃药能有啥快感。 -黄玫瑰888- ♀ (0 bytes) () 10/31/2015 postreply 19:45:59

• 这是另一类，叫 stimulants -几颗汗滴- ♂ (0 bytes) () 10/31/2015 postreply 19:56:17