Is it safe to execute an Effect twice?

const increment = (x: number) => x + 1;

const divide = (
    a: number,
    b: number
): Effect.Effect<never, Error, number> =>
    b === 0
        ? Effect.fail(new Error("Cannot divide by zero"))
        : Effect.succeed(a / b);

const task1 = Effect.promise(() => Promise.resolve(10));
const task2 = Effect.promise(() => Promise.resolve(2));

const program = Effect.gen(function* (_) {
    const a = yield* _(task1);
    const b = yield* _(task2);
    const n1 = yield* _(divide(a, b));
    const n2 = increment(n1);
    return `Result is: ${n2}`;
});

Effect.runPromise(program).then(console.log);

Effect.runPromise(program).then(console.log);