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<?php
add_filter( 'woocommerce_add_cart_item_data', 'woo_custom_add_to_cart' , 10, 3);

function woo_custom_add_to_cart( $cart_item_data, $product_id, $variation_id ) {

  
    foreach( WC()->cart->get_cart() as $cart_item_key => $values ) {
		$_product = $values['data'];		
		if( $product_id == $_product->id ) {
			
			WC()->cart->set_quantity($cart_item_key, 0);
		}
	}

    // Do nothing with the data and return
    return $cart_item_data;
}