Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Mar. 09, 2021
Jun. 30, 2020
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity File Number 001-36338    
Entity Registrant Name 22nd Century Group, Inc.    
Entity Central Index Key 0001347858    
Current Fiscal Year End Date --12-31    
Entity Incorporation, State or Country Code NV    
Entity Tax Identification Number 98-0468420    
Entity Address, Address Line One 8560 Main Street    
Entity Address, Address Line Two Suite 4    
Entity Address, City or Town Williamsville    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 14221    
City Area Code 716    
Local Phone Number 270-1523    
Title of 12(b) Security Common Stock, $0.00001 par value    
Security Exchange Name NYSEAMER    
Trading Symbol XXII    
Entity Current Reporting Status Yes    
ICFR Auditor Attestation Flag false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 106
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   149,615,010