Well, we are not allowed to do your homework for you, that is why people suggest what it should focus on. Think about the characteristics of the drug, though -- then you should be able to come up with something beginning with each letter that is a characteristic of the drug that you could incorporate into a poem.
So, for example, with ECSTASY, some words and phrases that you might use are:
Exposure to the drug is dangerous, Evil
Cardiovascular failure, Cruddy feeling, Causes death
Sharp increase in body temperature (see below)
Toxic, Terrible, Taste-destroyng, Temperature rising
Altered judgment, As bad as Alcohol poisoning, Awful, Atrocious, After effects
Symptoms, Sweating, Silly, Sinful, Soul-wrenching
You are playing with fire; Yellow skin, Yellow teeth, Yogurt breath
So, the poem could start out:
Everybody is not doing it! Why, then, should I?
Can't you just leave me alone?
Stop it! I'm cool, I don't need to get high
Too smart am I to get stoned!
You need to write the rest of it yourself. This is a kind of lame poem, but you can do better. We teachers get in trouble if we do too much of the work for you! So, go for it!