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You should rent to him with proper rent agreement ..
without rent agreement i don't suggest.
This is quite amusing. As if they'd expect you to be willing to rent when they can't even maintain the one they have currently. Thanks for the good chuckle, hope you didn't rent to him 
One problem with renting to drug users is the chemicals given off by the drugs. Most potheads eventual escalate to other types of drugs. The chemicals given off by these drugs can infiltrate into the walls of a house. You may then have to replace the wallboard before renting out the house again.
And, the reason he is behind in his rent may be tied to his drug dependency.
Haha. I definitely wouldn't. First, he's behind on the other, so what's to say he won't on yours, and, well, the drug problem is kind of an obvious reason against it...like nevadascul said, it can really cause problems.