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.
Inbound SMS. Twilio places no limitation on the rate at which a number can receive SMS messages. Twilio will make an HTTP request to the request URL for each message received at your Twilio number. Therefore, please make sure your server is capable of handling the load if you are expecting a large amount of concurrent inbound traffic.