The good news is that, unless an animal is confined in a pillowcase (as above) or in a room with extreme amounts of smoke, inhaling secondhand marijuana smoke is not likely to lead to intoxication. If this were a concern, it would be hard to walk the streets of San Francisco without catching a secondhand buzz.
If you have a message with multiple segments (a message over 160 characters will be broken up into 160-character segments), Twilio will queue the messages and release them at the rate of one message segment per second.
MMS can have up to 1000 characters. Depending on your phone, and the phone/carrier of the person recieving your message, longer messages may be truncated, or they may be split up and sent as multiple extended messages.