Can i smoke e cig on vyvanse (lisdexamfetamine) or do i smoke it on days i don't take vyvanse (lisdexamfetamine)?

Can smoke: There is no contraindication in smoking a cigarette or e-cigarette with taking a stimulant.

Ideally, Neither: Try to not smoke on any days. Regardless, smoking and vyvanse (lisdexamfetamine) are not toxic with each other though they both can raise your heart rate and blood pressure. Stimulants like vyvanse (lisdexamfetamine) frequently cause people to smoke more or increase compulsive activities.