Yes, a lighter can explode if left in the dryer inside a jean's pocket. Lighters typically contain flammable gas (such as butane) under pressure, which is used to produce the flame when ignited. When a lighter is exposed to high temperatures, such as those found inside a dryer during the drying cycle, the heat can cause the gas inside the lighter to expand rapidly. This increased pressure can lead to a potential explosion.
If a lighter is accidentally left in a pocket and goes through the drying cycle, it can be very dangerous. The explosion can cause damage to the dryer, and it may even lead to injury or fire hazards if the explosion is strong enough to rupture the dryer or nearby objects.
To avoid such incidents, it's crucial to check all pockets of clothing, including jeans, before placing them in the dryer. Additionally, make sure to keep lighters away from high-temperature environments and store them in a safe place when not in use. Safety measures and awareness are essential to prevent accidents and potential harm.