Please help with below

1) If I get doubt when doing Salam about performance of tashahud should I ignore ?

2) If I know for sure if I start my 2nd Sura in jamat salah I will have to break it to continue with Imam should I start the 2nd Sura and break or just wait after Sura hamd Will muwalat break here ?

3) Are poppy seeds ok and halal ? Are they addictive and haraam ?

1- Yes you ignore it because you entered a new act of Salat (which is the Tasleem).

2- Start the Surah and then when you have to do ruku’ break it

3- If they don’t intoxicate and taken in small quantities such that they don’t harm your health, they are permissible.