I am scared both for the property and for my liability if he were to injure himself.I am very new at this, so it didn't even occur to me to write anything into the lease about excessive drunkenness.

3) Kid was sick / injured / hospitalized?

Insurance varies but it covers damages to the property and protection if a tenant gets injured and sues.

I have reason to believe that if I had unwittingly created a spark or open flame, I could have inadvertently blown up the house and been severely injured, if not worse.

People injured on your property will go after the biggest source of money, the landlord... don't give them more ways for them to do that..

Luckily nobody injured, but the adjacent property was so badly damaged, the city fully demolished it the next day.It is definitely a surreal experience dealing with this exact issue.  

I'd tell him that I understand his client would have to prove he injured himself on my property because of my negligence and that is going to be pretty hard to prove.

Does that protect your building from structural damage and potentially injuring someone?

If you are the piece holding everything together, it could be a nightmare if you were to get sick or injured.

Sherry Young was injured along with four others, including three firefighters, the Detroit Free Press reported.Young told the newspaper she had doused herself with rubbing alcohol before it was ignited by a stove and oven.