I was recently in a huge car accident my car flipped 6 times over the median on the interstate and my lungs collapsed isit dangerous to smoke marijana?

Yes, it could be: It is usual for people who are smoking marijuana to take very deep breaths and then to hold that breath for a period of time to increase the absorption of the drug. This maneuver increases pressure in the lungs, and if you have already had a pneumothorax, will expose you to the risk of it recurring. Were you smoking weed when you had the accident? If so, you have a problem with weed and need help.