Weed! But the question isn't fair to Marijuana. The availability and addictive nature of Cigs make it almost impossible for Weed to gain ground until recently.
Truly an apples and oranges question, might as well ask "weed or DMT", or "cigarettes or crack", just because you can smoke two things doesn't make them comparable. A better comparison is "tobacco or cannabis", as both can produce profound states and visionary experiences if done properly. Tobacco =/= cigarettes, cigarettes are a carefully crafted mix of carcinogens, teratogens, and flat out super toxic chemicals like hydrogen cyanide, overlaid ontop some nicotine-enriched tobacco to maximize various factors such as addiction, length of burn, smoothness of burn, etc. If you've ever smoked just pure tobacco in a pipe or even flavored shisha from a hooka, you will see that cigarettes are much, much worse than just tobacco on its own.
Weeed, totally prefer tweeds over cigs. I wish they sold weed in the stores like they sell cigarettes. I bet if they did that we'd be colonizing the universe, and innerverse in like 4 months.