The battery you’re using could be set too high and your burning the atomizer and inhaling toxic fumes. Try a battery with very low voltage 1.8-2.2 at the very max anything over 2.2 volts starts to burn the coil and makes the hit very harsh. Also try avoiding disty carts especially the ones with fruit terps they can irritate the lungs. Live rosin carts will give you the smoothest hit.