yeah my wife and i have both used this for years. here's a snippet from TGA professor paul kelly:

"If someone were to take a ranitidine tablet for their entire life for 70 years, every day, then the risk of cancer may go up by about one in 100,000, so I think you can see from those figures it's a very small risk."

that put a lid on it for me. they have to be cautious but in terms of things that actually cause cancer i wouldn't give this another thought.