Compared to mammals, snakes are pretty dumb. But they aren't dumb enough to crawl into someone's mouth. And most snakes are in more danger from a cat than a cat is from a snake. If you have a cat, a lock on the snake cage is highly recommended, to protect the snake.
Boa constrictors are great snakes, and one of my favorites! They are as mellow as snakes come, if raised from a baby.
The Hogg Island and Crawl Cay boa constrictors are the dwarf versions of the common boa constrictor (AKA redtail boa, Colombian boa, Honduran boa, Central American boa, etc). Many of the boa constrictors found in Central America are relatively small, though, compared to the lowland boa constrictors from Colombia. The real dwarf boas are small burrowing snakes than you have probably never heard of.
Many pet stores sell boa constrictors, but you are more likely to get a Hogg Island or crossbred Hogg Island/mainland boa or albino boa constrictor at a reptile swap meet. They are held in many cities across the country. Schedules can be found on line.
Vincent Russo wrote a good book about boa constrictors (Complete Boa Constrictor: A Comprehensive Guide to the Care, Breeding, and Geographic Races). It's available from Amazon, but it is rather costly. You may want to try borrowing it through your library's Interlibrary Loan system instead of buying it.