I would concede that some smoking advocates do the same for marijuana. Also, many anti-smokers are anti-marijuana. Generalities simply do not make sense and are detrimental to the various discussions. When members equate tobacco with marijuana ... I fully understand why tobacco comes out on the short end of any discussion. We tobacco users can only sit on the sidelines, wringing our hands, complain about the unfairness of it all, and bemoan the tyranny of the majority. "Life's a bitch and then you die!"
Tobacco is socially not acceptable. Marijuana is somewhat, in some places, socially acceptable. Pro-marijuana voters are well funded and organized. Anti-tobacco groups are well funded and organized. Pro-tobacco? Unorganized, not even poorly organized. Funded? Not at all.
Lastly, there is perceived to be moneys to be made in the marijuana industry. We'll see what the future brings. Tobacco profits? Less and less each year in the Western World. As usual it always boils down to profits. But, continually obfuscating, muddying the waters, etc. by attempting to join the drug and the weed in discussions does not further the position of tobacco use.