Is Vaping Haram?
بِسْمِ اللهِ الرَّحْمنِ الرَّحِيْم
In the name of Allah, the Gracious, the Merciful
The ruling on vaping is subject to:  the substance of the e-cigarette vapour and  the effects of vaping.
If the substance of the e-cigarette is pure, such as artificial flavours, and its usage does not harm one, then it is permissible although discouraged as this resembles the act of smoking which is predominantly done by non-Muslims and those heedless of Allāh Ta’ālā.
If the substance is tobacco, then it is makrūh for the following reasons:
 Can potentially harm one’s health
 Can potentially harm others due to bad odour, the smoke, etc.
 This act is majorly seen committed by non-Muslims, sinners and those heedless of Allāh, therefore imitating them is disliked, as one is putting one’s reputation and dignity at risk of being tarnished.
 It can get addicting and lead to the usage of other haram substances.
Refer to the link below for more detail:
Only Allāh knows best
Written by Alimah Sabrina al-Faarsiyyah
Checked and approved by Mufti Mohammed Tosir Miah
Darul Iftā Birmingham
 Mufti Abdurrahim Lajpuri, Fatawa Rahimiyyah, V.10 Pg.211, Darul Isha’ah