Is it safe to smoke marijuana while taking tamiflu (oseltamivir)?

I would think so: Although, tamiflu (oseltamivir) is prescribed for the influenza virus which can attack the lungs. Therefore, you may want to refrain from smoking due to the risk of more irritation on your lungs. But i know of no interactions, although the combination of tamiflu (oseltamivir) and cannabis has not been scientifically tested for safety.

No: It is never safe to smoke marijuana, without or without taking other medications.

No. Smoke is toxic.: Toxic means unsafe, or really unsafe. The intentional habit of inhaling burning organic material, combined with various chemicals used in the growing and manufacturing of that material (regardless of whether it is tobacco, marijuana, or any other plant) is bad for the body. Just think about it. Who would intentionally start something burning and inhale the stuff over and over and over?