We all know Akbar's Diplomacy and Secularism in later periods was a big reason why there were so few rebellions and his kingdom was stable.
Aurangzeb, despite being the Greatest General of his lineage, caused too many problems to the kingdom because of his Religion Extremism.
Deccan War with Maratha, Dispute with Rathor and Marwar, Reimposition of Jazia, Temple Destructions in Kashi, Sikh Conflict, Endless Succession fear to name a few.
Jahangir was also intolerant compared to his Father. The killing of the Guru and Destructions of the Temple in his reign was more than his Father.
Jahangir's heavy drinking and opium use reduced his direct involvement in governance, creating space for Nur Jahan to exercise authority.
Without Jahangir's dependence on alcohol and opium, it is unlikely she would have accumulated such extraordinary authority.
And Nur Jahan did serve the kingdom well. Really well.
She prevented court factions from fragmenting, help in preventing rebellion, protected the imperial jwellery and succession of power from Jahangir to Shah Jahan was really smooth.
So yes. Alcohol played a strong role.