Our heart rate is controlled by several factors, both from outside and inside our body. Some substances that we take can affect the way our heartbeats because they have a direct effect on our nervous system, which controls our vegetative functions, including our heartbeat. In some cases, substances that we take can stimulate the release of hormones such as adrenalin, which increase the heart rate and can cause tachycardia.
Some stimulants are substances that we consume daily, but they can raise our heartbeat, especially if consumed at a high dose. Examples of daily use stimulants include caffeine, found in café and some medications for the pain and fatigue; nicotine, a compound found in tobacco, cigarettes and vapers; and some infusions. If you have tachycardia and normally consume one or more of these substances, then you should moderate or even quit their use to give your heart a break.