Electronic cigarettes should be subject to the same taxes, marketing restrictions and limitations on public use as traditional tobacco products, according to new guidance from cancer experts.

In a joint policy statement issued Thursday, the American Association for Cancer Research and the American Society for Clinical Oncology acknowledged that e-cigarettes may improve public health by taking market share away from combustible tobacco products and helping smokers quit. But until the benefits are proved, the statement said, regulators shouldn’t distinguish between the two kinds of products.